Merge tag 'driver-core-4.14-rc1' of...

Merge tag 'driver-core-4.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core update from Greg KH:
 "Here is the "big" driver core update for 4.14-rc1.

  It's really not all that big, the largest thing here being some
  firmware tests to help ensure that that crazy api is working properly.

  There's also a new uevent for when a driver is bound or unbound from a
  device, fixing a hole in the driver model that's been there since the
  very beginning. Many thanks to Dmitry for being persistent and
  pointing out how wrong I was about this all along :)

  Patches for the new uevents are already in the systemd tree, if people
  want to play around with them.

  Otherwise just a number of other small api changes and updates here,
  nothing major. All of these patches have been in linux-next for a
  while with no reported issues"

* tag 'driver-core-4.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (28 commits)
  driver core: bus: Fix a potential double free
  Do not disable driver and bus shutdown hook when class shutdown hook is set.
  base: topology: constify attribute_group structures.
  base: Convert to using %pOF instead of full_name
  kernfs: Clarify lockdep name for kn->count
  fbdev: uvesafb: remove DRIVER_ATTR() usage
  xen: xen-pciback: remove DRIVER_ATTR() usage
  driver core: Document struct device:dma_ops
  mod_devicetable: Remove excess description from structured comment
  test_firmware: add batched firmware tests
  firmware: enable a debug print for batched requests
  firmware: define pr_fmt
  firmware: send -EINTR on signal abort on fallback mechanism
  test_firmware: add test case for SIGCHLD on sync fallback
  initcall_debug: add deferred probe times
  Input: axp20x-pek - switch to using devm_device_add_group()
  Input: synaptics_rmi4 - use devm_device_add_group() for attributes in F01
  Input: gpio_keys - use devm_device_add_group() for attributes
  driver core: add devm_device_add_group() and friends
  driver core: add device_{add|remove}_group() helpers
  ...

drivers/base/arch_topology.c

@@ -41,8 +41,7 @@ static ssize_t cpu_capacity_show(struct device *dev,
 {
 	struct cpu *cpu = container_of(dev, struct cpu, dev);
 
-	return sprintf(buf, "%lu\n",
-			topology_get_cpu_scale(NULL, cpu->dev.id));
+	return sprintf(buf, "%lu\n", topology_get_cpu_scale(NULL, cpu->dev.id));
 }
 
 static ssize_t cpu_capacity_store(struct device *dev,
@@ -96,14 +95,21 @@ subsys_initcall(register_cpu_capacity_sysctl);
 
 static u32 capacity_scale;
 static u32 *raw_capacity;
-static bool cap_parsing_failed;
+
+static int __init free_raw_capacity(void)
+{
+	kfree(raw_capacity);
+	raw_capacity = NULL;
+
+	return 0;
+}
 
 void topology_normalize_cpu_scale(void)
 {
 	u64 capacity;
 	int cpu;
 
-	if (!raw_capacity || cap_parsing_failed)
+	if (!raw_capacity)
 		return;
 
 	pr_debug("cpu_capacity: capacity_scale=%u\n", capacity_scale);
@@ -120,16 +126,16 @@ void topology_normalize_cpu_scale(void)
 	mutex_unlock(&cpu_scale_mutex);
 }
 
-int __init topology_parse_cpu_capacity(struct device_node *cpu_node, int cpu)
+bool __init topology_parse_cpu_capacity(struct device_node *cpu_node, int cpu)
 {
-	int ret = 1;
+	static bool cap_parsing_failed;
+	int ret;
 	u32 cpu_capacity;
 
 	if (cap_parsing_failed)
-		return !ret;
+		return false;
 
-	ret = of_property_read_u32(cpu_node,
-				   "capacity-dmips-mhz",
+	ret = of_property_read_u32(cpu_node, "capacity-dmips-mhz",
 				   &cpu_capacity);
 	if (!ret) {
 		if (!raw_capacity) {
@@ -139,21 +145,21 @@ int __init topology_parse_cpu_capacity(struct device_node *cpu_node, int cpu)
 			if (!raw_capacity) {
 				pr_err("cpu_capacity: failed to allocate memory for raw capacities\n");
 				cap_parsing_failed = true;
-				return 0;
+				return false;
 			}
 		}
 		capacity_scale = max(cpu_capacity, capacity_scale);
 		raw_capacity[cpu] = cpu_capacity;
-		pr_debug("cpu_capacity: %s cpu_capacity=%u (raw)\n",
-			cpu_node->full_name, raw_capacity[cpu]);
+		pr_debug("cpu_capacity: %pOF cpu_capacity=%u (raw)\n",
+			cpu_node, raw_capacity[cpu]);
 	} else {
 		if (raw_capacity) {
-			pr_err("cpu_capacity: missing %s raw capacity\n",
-				cpu_node->full_name);
+			pr_err("cpu_capacity: missing %pOF raw capacity\n",
+				cpu_node);
 			pr_err("cpu_capacity: partial information: fallback to 1024 for all CPUs\n");
 		}
 		cap_parsing_failed = true;
-		kfree(raw_capacity);
+		free_raw_capacity();
 	}
 
 	return !ret;
@@ -161,7 +167,6 @@ int __init topology_parse_cpu_capacity(struct device_node *cpu_node, int cpu)
 
 #ifdef CONFIG_CPU_FREQ
 static cpumask_var_t cpus_to_visit;
-static bool cap_parsing_done;
 static void parsing_done_workfn(struct work_struct *work);
 static DECLARE_WORK(parsing_done_work, parsing_done_workfn);
 
@@ -173,30 +178,31 @@ init_cpu_capacity_callback(struct notifier_block *nb,
 	struct cpufreq_policy *policy = data;
 	int cpu;
 
-	if (cap_parsing_failed || cap_parsing_done)
+	if (!raw_capacity)
+		return 0;
+
+	if (val != CPUFREQ_NOTIFY)
 		return 0;
 
-	switch (val) {
-	case CPUFREQ_NOTIFY:
 	pr_debug("cpu_capacity: init cpu capacity for CPUs [%*pbl] (to_visit=%*pbl)\n",
 		 cpumask_pr_args(policy->related_cpus),
 		 cpumask_pr_args(cpus_to_visit));
-		cpumask_andnot(cpus_to_visit,
-			       cpus_to_visit,
-			       policy->related_cpus);
+
+	cpumask_andnot(cpus_to_visit, cpus_to_visit, policy->related_cpus);
+
 	for_each_cpu(cpu, policy->related_cpus) {
 		raw_capacity[cpu] = topology_get_cpu_scale(NULL, cpu) *
 				    policy->cpuinfo.max_freq / 1000UL;
 		capacity_scale = max(raw_capacity[cpu], capacity_scale);
 	}
+
 	if (cpumask_empty(cpus_to_visit)) {
 		topology_normalize_cpu_scale();
-			kfree(raw_capacity);
+		free_raw_capacity();
 		pr_debug("cpu_capacity: parsing done\n");
-			cap_parsing_done = true;
 		schedule_work(&parsing_done_work);
 	}
-	}
+
 	return 0;
 }
 
@@ -233,11 +239,5 @@ static void parsing_done_workfn(struct work_struct *work)
 }
 
 #else
-static int __init free_raw_capacity(void)
-{
-	kfree(raw_capacity);
-
-	return 0;
-}
 core_initcall(free_raw_capacity);
 #endif

drivers/base/base.h

@@ -126,11 +126,6 @@ extern int driver_add_groups(struct device_driver *drv,
 extern void driver_remove_groups(struct device_driver *drv,
 				 const struct attribute_group **groups);
 
-extern int device_add_groups(struct device *dev,
-			     const struct attribute_group **groups);
-extern void device_remove_groups(struct device *dev,
-				 const struct attribute_group **groups);
-
 extern char *make_class_name(const char *name, struct kobject *kobj);
 
 extern int devres_release_all(struct device *dev);

drivers/base/bus.c

@@ -698,7 +698,7 @@ int bus_add_driver(struct device_driver *drv)
 
 out_unregister:
 	kobject_put(&priv->kobj);
-	kfree(drv->p);
+	/* drv->p is freed in driver_release()  */
 	drv->p = NULL;
 out_put_bus:
 	bus_put(bus);

drivers/base/core.c

@@ -1023,12 +1023,144 @@ int device_add_groups(struct device *dev, const struct attribute_group **groups)
 {
 	return sysfs_create_groups(&dev->kobj, groups);
 }
+EXPORT_SYMBOL_GPL(device_add_groups);
 
 void device_remove_groups(struct device *dev,
 			  const struct attribute_group **groups)
 {
 	sysfs_remove_groups(&dev->kobj, groups);
 }
+EXPORT_SYMBOL_GPL(device_remove_groups);
+
+union device_attr_group_devres {
+	const struct attribute_group *group;
+	const struct attribute_group **groups;
+};
+
+static int devm_attr_group_match(struct device *dev, void *res, void *data)
+{
+	return ((union device_attr_group_devres *)res)->group == data;
+}
+
+static void devm_attr_group_remove(struct device *dev, void *res)
+{
+	union device_attr_group_devres *devres = res;
+	const struct attribute_group *group = devres->group;
+
+	dev_dbg(dev, "%s: removing group %p\n", __func__, group);
+	sysfs_remove_group(&dev->kobj, group);
+}
+
+static void devm_attr_groups_remove(struct device *dev, void *res)
+{
+	union device_attr_group_devres *devres = res;
+	const struct attribute_group **groups = devres->groups;
+
+	dev_dbg(dev, "%s: removing groups %p\n", __func__, groups);
+	sysfs_remove_groups(&dev->kobj, groups);
+}
+
+/**
+ * devm_device_add_group - given a device, create a managed attribute group
+ * @dev:	The device to create the group for
+ * @grp:	The attribute group to create
+ *
+ * This function creates a group for the first time.  It will explicitly
+ * warn and error if any of the attribute files being created already exist.
+ *
+ * Returns 0 on success or error code on failure.
+ */
+int devm_device_add_group(struct device *dev, const struct attribute_group *grp)
+{
+	union device_attr_group_devres *devres;
+	int error;
+
+	devres = devres_alloc(devm_attr_group_remove,
+			      sizeof(*devres), GFP_KERNEL);
+	if (!devres)
+		return -ENOMEM;
+
+	error = sysfs_create_group(&dev->kobj, grp);
+	if (error) {
+		devres_free(devres);
+		return error;
+	}
+
+	devres->group = grp;
+	devres_add(dev, devres);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(devm_device_add_group);
+
+/**
+ * devm_device_remove_group: remove a managed group from a device
+ * @dev:	device to remove the group from
+ * @grp:	group to remove
+ *
+ * This function removes a group of attributes from a device. The attributes
+ * previously have to have been created for this group, otherwise it will fail.
+ */
+void devm_device_remove_group(struct device *dev,
+			      const struct attribute_group *grp)
+{
+	WARN_ON(devres_release(dev, devm_attr_group_remove,
+			       devm_attr_group_match,
+			       /* cast away const */ (void *)grp));
+}
+EXPORT_SYMBOL_GPL(devm_device_remove_group);
+
+/**
+ * devm_device_add_groups - create a bunch of managed attribute groups
+ * @dev:	The device to create the group for
+ * @groups:	The attribute groups to create, NULL terminated
+ *
+ * This function creates a bunch of managed attribute groups.  If an error
+ * occurs when creating a group, all previously created groups will be
+ * removed, unwinding everything back to the original state when this
+ * function was called.  It will explicitly warn and error if any of the
+ * attribute files being created already exist.
+ *
+ * Returns 0 on success or error code from sysfs_create_group on failure.
+ */
+int devm_device_add_groups(struct device *dev,
+			   const struct attribute_group **groups)
+{
+	union device_attr_group_devres *devres;
+	int error;
+
+	devres = devres_alloc(devm_attr_groups_remove,
+			      sizeof(*devres), GFP_KERNEL);
+	if (!devres)
+		return -ENOMEM;
+
+	error = sysfs_create_groups(&dev->kobj, groups);
+	if (error) {
+		devres_free(devres);
+		return error;
+	}
+
+	devres->groups = groups;
+	devres_add(dev, devres);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(devm_device_add_groups);
+
+/**
+ * devm_device_remove_groups - remove a list of managed groups
+ *
+ * @dev:	The device for the groups to be removed from
+ * @groups:	NULL terminated list of groups to be removed
+ *
+ * If groups is not NULL, remove the specified groups from the device.
+ */
+void devm_device_remove_groups(struct device *dev,
+			       const struct attribute_group **groups)
+{
+	WARN_ON(devres_release(dev, devm_attr_groups_remove,
+			       devm_attr_group_match,
+			       /* cast away const */ (void *)groups));
+}
+EXPORT_SYMBOL_GPL(devm_device_remove_groups);
 
 static int device_add_attrs(struct device *dev)
 {
@@ -2664,11 +2796,12 @@ void device_shutdown(void)
 		pm_runtime_get_noresume(dev);
 		pm_runtime_barrier(dev);
 
-		if (dev->class && dev->class->shutdown) {
+		if (dev->class && dev->class->shutdown_pre) {
 			if (initcall_debug)
-				dev_info(dev, "shutdown\n");
-			dev->class->shutdown(dev);
-		} else if (dev->bus && dev->bus->shutdown) {
+				dev_info(dev, "shutdown_pre\n");
+			dev->class->shutdown_pre(dev);
+		}
+		if (dev->bus && dev->bus->shutdown) {
 			if (initcall_debug)
 				dev_info(dev, "shutdown\n");
 			dev->bus->shutdown(dev);

drivers/base/dd.c

@@ -20,6 +20,7 @@
 #include <linux/device.h>
 #include <linux/delay.h>
 #include <linux/dma-mapping.h>
+#include <linux/init.h>
 #include <linux/module.h>
 #include <linux/kthread.h>
 #include <linux/wait.h>
@@ -53,6 +54,7 @@ static DEFINE_MUTEX(deferred_probe_mutex);
 static LIST_HEAD(deferred_probe_pending_list);
 static LIST_HEAD(deferred_probe_active_list);
 static atomic_t deferred_trigger_count = ATOMIC_INIT(0);
+static bool initcalls_done;
 
 /*
  * In some cases, like suspend to RAM or hibernation, It might be reasonable
@@ -61,6 +63,26 @@ static atomic_t deferred_trigger_count = ATOMIC_INIT(0);
  */
 static bool defer_all_probes;
 
+/*
+ * For initcall_debug, show the deferred probes executed in late_initcall
+ * processing.
+ */
+static void deferred_probe_debug(struct device *dev)
+{
+	ktime_t calltime, delta, rettime;
+	unsigned long long duration;
+
+	printk(KERN_DEBUG "deferred probe %s @ %i\n", dev_name(dev),
+	       task_pid_nr(current));
+	calltime = ktime_get();
+	bus_probe_device(dev);
+	rettime = ktime_get();
+	delta = ktime_sub(rettime, calltime);
+	duration = (unsigned long long) ktime_to_ns(delta) >> 10;
+	printk(KERN_DEBUG "deferred probe %s returned after %lld usecs\n",
+	       dev_name(dev), duration);
+}
+
 /*
  * deferred_probe_work_func() - Retry probing devices in the active list.
  */
@@ -106,6 +128,9 @@ static void deferred_probe_work_func(struct work_struct *work)
 		device_pm_unlock();
 
 		dev_dbg(dev, "Retrying from deferred list\n");
+		if (initcall_debug && !initcalls_done)
+			deferred_probe_debug(dev);
+		else
 			bus_probe_device(dev);
 
 		mutex_lock(&deferred_probe_mutex);
@@ -215,6 +240,7 @@ static int deferred_probe_initcall(void)
 	driver_deferred_probe_trigger();
 	/* Sort as many dependencies as possible before exiting initcalls */
 	flush_work(&deferred_probe_work);
+	initcalls_done = true;
 	return 0;
 }
 late_initcall(deferred_probe_initcall);
@@ -259,6 +285,8 @@ static void driver_bound(struct device *dev)
 	if (dev->bus)
 		blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
 					     BUS_NOTIFY_BOUND_DRIVER, dev);
+
+	kobject_uevent(&dev->kobj, KOBJ_BIND);
 }
 
 static int driver_sysfs_add(struct device *dev)
@@ -848,6 +876,8 @@ static void __device_release_driver(struct device *dev, struct device *parent)
 			blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
 						     BUS_NOTIFY_UNBOUND_DRIVER,
 						     dev);
+
+		kobject_uevent(&dev->kobj, KOBJ_UNBIND);
 	}
 }
 

drivers/base/firmware_class.c

@@ -7,6 +7,8 @@
  *
  */
 
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
 #include <linux/capability.h>
 #include <linux/device.h>
 #include <linux/module.h>
@@ -331,6 +333,7 @@ static struct firmware_buf *__fw_lookup_buf(const char *fw_name)
 	return NULL;
 }
 
+/* Returns 1 for batching firmware requests with the same name */
 static int fw_lookup_and_allocate_buf(const char *fw_name,
 				      struct firmware_cache *fwc,
 				      struct firmware_buf **buf, void *dbuf,
@@ -344,6 +347,7 @@ static int fw_lookup_and_allocate_buf(const char *fw_name,
 		kref_get(&tmp->ref);
 		spin_unlock(&fwc->lock);
 		*buf = tmp;
+		pr_debug("batched request - sharing the same struct firmware_buf and lookup for multiple requests\n");
 		return 1;
 	}
 	tmp = __allocate_fw_buf(fw_name, fwc, dbuf, size);
@@ -1085,9 +1089,12 @@ static int _request_firmware_load(struct firmware_priv *fw_priv,
 		mutex_unlock(&fw_lock);
 	}
 
-	if (fw_state_is_aborted(&buf->fw_st))
+	if (fw_state_is_aborted(&buf->fw_st)) {
+		if (retval == -ERESTARTSYS)
+			retval = -EINTR;
+		else
 			retval = -EAGAIN;
-	else if (buf->is_paged_buf && !buf->data)
+	} else if (buf->is_paged_buf && !buf->data)
 		retval = -ENOMEM;
 
 	device_del(f_dev);

drivers/base/topology.c

@@ -105,7 +105,7 @@ static struct attribute *default_attrs[] = {
 	NULL
 };
 
-static struct attribute_group topology_attr_group = {
+static const struct attribute_group topology_attr_group = {
 	.attrs = default_attrs,
 	.name = "topology"
 };

drivers/char/tpm/tpm-chip.c

@@ -164,14 +164,7 @@ static int tpm_class_shutdown(struct device *dev)
 		chip->ops = NULL;
 		up_write(&chip->ops_sem);
 	}
-	/* Allow bus- and device-specific code to run. Note: since chip->ops
-	 * is NULL, more-specific shutdown code will not be able to issue TPM
-	 * commands.
-	 */
-	if (dev->bus && dev->bus->shutdown)
-		dev->bus->shutdown(dev);
-	else if (dev->driver && dev->driver->shutdown)
-		dev->driver->shutdown(dev);
+
 	return 0;
 }
 
@@ -214,7 +207,7 @@ struct tpm_chip *tpm_chip_alloc(struct device *pdev,
 	device_initialize(&chip->devs);
 
 	chip->dev.class = tpm_class;
-	chip->dev.class->shutdown = tpm_class_shutdown;
+	chip->dev.class->shutdown_pre = tpm_class_shutdown;
 	chip->dev.release = tpm_dev_release;
 	chip->dev.parent = pdev;
 	chip->dev.groups = chip->groups;

drivers/input/keyboard/gpio_keys.c

@@ -827,7 +827,7 @@ static int gpio_keys_probe(struct platform_device *pdev)
 
 	fwnode_handle_put(child);
 
-	error = sysfs_create_group(&dev->kobj, &gpio_keys_attr_group);
+	error = devm_device_add_group(dev, &gpio_keys_attr_group);
 	if (error) {
 		dev_err(dev, "Unable to export keys/switches, error: %d\n",
 			error);
@@ -838,22 +838,11 @@ static int gpio_keys_probe(struct platform_device *pdev)
 	if (error) {
 		dev_err(dev, "Unable to register input device, error: %d\n",
 			error);
-		goto err_remove_group;
+		return error;
 	}
 
 	device_init_wakeup(dev, wakeup);
 
-	return 0;
-
-err_remove_group:
-	sysfs_remove_group(&dev->kobj, &gpio_keys_attr_group);
-	return error;
-}
-
-static int gpio_keys_remove(struct platform_device *pdev)
-{
-	sysfs_remove_group(&pdev->dev.kobj, &gpio_keys_attr_group);
-
 	return 0;
 }
 
@@ -912,7 +901,6 @@ static SIMPLE_DEV_PM_OPS(gpio_keys_pm_ops, gpio_keys_suspend, gpio_keys_resume);
 
 static struct platform_driver gpio_keys_device_driver = {
 	.probe		= gpio_keys_probe,
-	.remove		= gpio_keys_remove,
 	.driver		= {
 		.name	= "gpio-keys",
 		.pm	= &gpio_keys_pm_ops,

drivers/input/misc/axp20x-pek.c

@@ -182,13 +182,6 @@ static irqreturn_t axp20x_pek_irq(int irq, void *pwr)
 	return IRQ_HANDLED;
 }
 
-static void axp20x_remove_sysfs_group(void *_data)
-{
-	struct device *dev = _data;
-
-	sysfs_remove_group(&dev->kobj, &axp20x_attribute_group);
-}
-
 static int axp20x_pek_probe_input_device(struct axp20x_pek *axp20x_pek,
 					 struct platform_device *pdev)
 {
@@ -313,22 +306,13 @@ static int axp20x_pek_probe(struct platform_device *pdev)
 			return error;
 	}
 
-	error = sysfs_create_group(&pdev->dev.kobj, &axp20x_attribute_group);
+	error = devm_device_add_group(&pdev->dev, &axp20x_attribute_group);
 	if (error) {
 		dev_err(&pdev->dev, "Failed to create sysfs attributes: %d\n",
 			error);
 		return error;
 	}
 
-	error = devm_add_action(&pdev->dev,
-				axp20x_remove_sysfs_group, &pdev->dev);
-	if (error) {
-		axp20x_remove_sysfs_group(&pdev->dev);
-		dev_err(&pdev->dev, "Failed to add sysfs cleanup action: %d\n",
-			error);
-		return error;
-	}
-
 	platform_set_drvdata(pdev, axp20x_pek);
 
 	return 0;

drivers/input/rmi4/rmi_f01.c

@@ -570,18 +570,14 @@ static int rmi_f01_probe(struct rmi_function *fn)
 
 	dev_set_drvdata(&fn->dev, f01);
 
-	error = sysfs_create_group(&fn->rmi_dev->dev.kobj, &rmi_f01_attr_group);
+	error = devm_device_add_group(&fn->rmi_dev->dev, &rmi_f01_attr_group);
 	if (error)
-		dev_warn(&fn->dev, "Failed to create sysfs group: %d\n", error);
+		dev_warn(&fn->dev,
+			 "Failed to create attribute group: %d\n", error);
 
 	return 0;
 }
 
-static void rmi_f01_remove(struct rmi_function *fn)
-{
-	sysfs_remove_group(&fn->rmi_dev->dev.kobj, &rmi_f01_attr_group);
-}
-
 static int rmi_f01_config(struct rmi_function *fn)
 {
 	struct f01_data *f01 = dev_get_drvdata(&fn->dev);
@@ -721,7 +717,6 @@ struct rmi_function_handler rmi_f01_handler = {
 	},
 	.func		= 0x01,
 	.probe		= rmi_f01_probe,
-	.remove		= rmi_f01_remove,
 	.config		= rmi_f01_config,
 	.attention	= rmi_f01_attention,
 	.suspend	= rmi_f01_suspend,

drivers/video/fbdev/uvesafb.c

@@ -1860,19 +1860,18 @@ static int uvesafb_setup(char *options)
 }
 #endif /* !MODULE */
 
-static ssize_t show_v86d(struct device_driver *dev, char *buf)
+static ssize_t v86d_show(struct device_driver *dev, char *buf)
 {
 	return snprintf(buf, PAGE_SIZE, "%s\n", v86d_path);
 }
 
-static ssize_t store_v86d(struct device_driver *dev, const char *buf,
+static ssize_t v86d_store(struct device_driver *dev, const char *buf,
 		size_t count)
 {
 	strncpy(v86d_path, buf, PATH_MAX);
 	return count;
 }
-
-static DRIVER_ATTR(v86d, S_IRUGO | S_IWUSR, show_v86d, store_v86d);
+static DRIVER_ATTR_RW(v86d);
 
 static int uvesafb_init(void)
 {

drivers/xen/xen-pciback/pci_stub.c

@@ -1172,7 +1172,7 @@ static int pcistub_reg_add(int domain, int bus, int slot, int func,
 	return err;
 }
 
-static ssize_t pcistub_slot_add(struct device_driver *drv, const char *buf,
+static ssize_t new_slot_store(struct device_driver *drv, const char *buf,
 			      size_t count)
 {
 	int domain, bus, slot, func;
@@ -1189,9 +1189,9 @@ static ssize_t pcistub_slot_add(struct device_driver *drv, const char *buf,
 		err = count;
 	return err;
 }
-static DRIVER_ATTR(new_slot, S_IWUSR, NULL, pcistub_slot_add);
+static DRIVER_ATTR_WO(new_slot);
 
-static ssize_t pcistub_slot_remove(struct device_driver *drv, const char *buf,
+static ssize_t remove_slot_store(struct device_driver *drv, const char *buf,
 				 size_t count)
 {
 	int domain, bus, slot, func;
@@ -1208,9 +1208,9 @@ static ssize_t pcistub_slot_remove(struct device_driver *drv, const char *buf,
 		err = count;
 	return err;
 }
-static DRIVER_ATTR(remove_slot, S_IWUSR, NULL, pcistub_slot_remove);
+static DRIVER_ATTR_WO(remove_slot);
 
-static ssize_t pcistub_slot_show(struct device_driver *drv, char *buf)
+static ssize_t slots_show(struct device_driver *drv, char *buf)
 {
 	struct pcistub_device_id *pci_dev_id;
 	size_t count = 0;
@@ -1231,9 +1231,9 @@ static ssize_t pcistub_slot_show(struct device_driver *drv, char *buf)
 
 	return count;
 }
-static DRIVER_ATTR(slots, S_IRUSR, pcistub_slot_show, NULL);
+static DRIVER_ATTR_RO(slots);
 
-static ssize_t pcistub_irq_handler_show(struct device_driver *drv, char *buf)
+static ssize_t irq_handlers_show(struct device_driver *drv, char *buf)
 {
 	struct pcistub_device *psdev;
 	struct xen_pcibk_dev_data *dev_data;
@@ -1260,11 +1260,10 @@ static ssize_t pcistub_irq_handler_show(struct device_driver *drv, char *buf)
 	spin_unlock_irqrestore(&pcistub_devices_lock, flags);
 	return count;
 }
-static DRIVER_ATTR(irq_handlers, S_IRUSR, pcistub_irq_handler_show, NULL);
+static DRIVER_ATTR_RO(irq_handlers);
 
-static ssize_t pcistub_irq_handler_switch(struct device_driver *drv,
-					  const char *buf,
-					  size_t count)
+static ssize_t irq_handler_state_store(struct device_driver *drv,
+				       const char *buf, size_t count)
 {
 	struct pcistub_device *psdev;
 	struct xen_pcibk_dev_data *dev_data;
@@ -1301,10 +1300,9 @@ static ssize_t pcistub_irq_handler_switch(struct device_driver *drv,
 		err = count;
 	return err;
 }
-static DRIVER_ATTR(irq_handler_state, S_IWUSR, NULL,
-		   pcistub_irq_handler_switch);
+static DRIVER_ATTR_WO(irq_handler_state);
 
-static ssize_t pcistub_quirk_add(struct device_driver *drv, const char *buf,
+static ssize_t quirks_store(struct device_driver *drv, const char *buf,
 			    size_t count)
 {
 	int domain, bus, slot, func, reg, size, mask;
@@ -1323,7 +1321,7 @@ static ssize_t pcistub_quirk_add(struct device_driver *drv, const char *buf,
 	return err;
 }
 
-static ssize_t pcistub_quirk_show(struct device_driver *drv, char *buf)
+static ssize_t quirks_show(struct device_driver *drv, char *buf)
 {
 	int count = 0;
 	unsigned long flags;
@@ -1366,10 +1364,9 @@ static ssize_t pcistub_quirk_show(struct device_driver *drv, char *buf)
 
 	return count;
 }
-static DRIVER_ATTR(quirks, S_IRUSR | S_IWUSR, pcistub_quirk_show,
-		   pcistub_quirk_add);
+static DRIVER_ATTR_RW(quirks);
 
-static ssize_t permissive_add(struct device_driver *drv, const char *buf,
+static ssize_t permissive_store(struct device_driver *drv, const char *buf,
 				size_t count)
 {
 	int domain, bus, slot, func;
@@ -1431,8 +1428,7 @@ static ssize_t permissive_show(struct device_driver *drv, char *buf)
 	spin_unlock_irqrestore(&pcistub_devices_lock, flags);
 	return count;
 }
-static DRIVER_ATTR(permissive, S_IRUSR | S_IWUSR, permissive_show,
-		   permissive_add);
+static DRIVER_ATTR_RW(permissive);
 
 static void pcistub_exit(void)
 {

fs/kernfs/file.c

@@ -997,7 +997,7 @@ struct kernfs_node *__kernfs_create_file(struct kernfs_node *parent,
 
 #ifdef CONFIG_DEBUG_LOCK_ALLOC
 	if (key) {
-		lockdep_init_map(&kn->dep_map, "s_active", key, 0);
+		lockdep_init_map(&kn->dep_map, "kn->count", key, 0);
 		kn->flags |= KERNFS_LOCKDEP;
 	}
 #endif

include/linux/arch_topology.h

@@ -4,10 +4,12 @@
 #ifndef _LINUX_ARCH_TOPOLOGY_H_
 #define _LINUX_ARCH_TOPOLOGY_H_
 
+#include <linux/types.h>
+
 void topology_normalize_cpu_scale(void);
 
 struct device_node;
-int topology_parse_cpu_capacity(struct device_node *cpu_node, int cpu);
+bool topology_parse_cpu_capacity(struct device_node *cpu_node, int cpu);
 
 struct sched_domain;
 unsigned long topology_get_cpu_scale(struct sched_domain *sd, int cpu);

include/linux/debugfs.h

@@ -196,6 +196,14 @@ static inline struct dentry *debugfs_create_file(const char *name, umode_t mode,
 	return ERR_PTR(-ENODEV);
 }
 
+static inline struct dentry *debugfs_create_file_unsafe(const char *name,
+					umode_t mode, struct dentry *parent,
+					void *data,
+					const struct file_operations *fops)
+{
+	return ERR_PTR(-ENODEV);
+}
+
 static inline struct dentry *debugfs_create_file_size(const char *name, umode_t mode,
 					struct dentry *parent, void *data,
 					const struct file_operations *fops,
@@ -289,6 +297,14 @@ static inline struct dentry *debugfs_create_u64(const char *name, umode_t mode,
 	return ERR_PTR(-ENODEV);
 }
 
+static inline struct dentry *debugfs_create_ulong(const char *name,
+						umode_t mode,
+						struct dentry *parent,
+						unsigned long *value)
+{
+	return ERR_PTR(-ENODEV);
+}
+
 static inline struct dentry *debugfs_create_x8(const char *name, umode_t mode,
 					       struct dentry *parent,
 					       u8 *value)

include/linux/device.h

@@ -375,7 +375,7 @@ int subsys_virtual_register(struct bus_type *subsys,
  * @suspend:	Used to put the device to sleep mode, usually to a low power
  *		state.
  * @resume:	Used to bring the device from the sleep mode.
- * @shutdown:	Called at shut-down time to quiesce the device.
+ * @shutdown_pre: Called at shut-down time before driver shutdown.
  * @ns_type:	Callbacks so sysfs can detemine namespaces.
  * @namespace:	Namespace of the device belongs to this class.
  * @pm:		The default device power management operations of this class.
@@ -404,7 +404,7 @@ struct class {
 
 	int (*suspend)(struct device *dev, pm_message_t state);
 	int (*resume)(struct device *dev);
-	int (*shutdown)(struct device *dev);
+	int (*shutdown_pre)(struct device *dev);
 
 	const struct kobj_ns_type_operations *ns_type;
 	const void *(*namespace)(struct device *dev);
@@ -847,6 +847,7 @@ struct dev_links_info {
  * @msi_list:	Hosts MSI descriptors
  * @msi_domain: The generic MSI domain this device is using.
  * @numa_node:	NUMA node this device is close to.
+ * @dma_ops:    DMA mapping operations for this device.
  * @dma_mask:	Dma mask (if dma'ble device).
  * @coherent_dma_mask: Like dma_mask, but for alloc_coherent mapping as not all
  * 		hardware supports 64-bit addresses for consistent allocations
@@ -1200,6 +1201,36 @@ struct device *device_create_with_groups(struct class *cls,
 			     const char *fmt, ...);
 extern void device_destroy(struct class *cls, dev_t devt);
 
+extern int __must_check device_add_groups(struct device *dev,
+					const struct attribute_group **groups);
+extern void device_remove_groups(struct device *dev,
+				 const struct attribute_group **groups);
+
+static inline int __must_check device_add_group(struct device *dev,
+					const struct attribute_group *grp)
+{
+	const struct attribute_group *groups[] = { grp, NULL };
+
+	return device_add_groups(dev, groups);
+}
+
+static inline void device_remove_group(struct device *dev,
+				       const struct attribute_group *grp)
+{
+	const struct attribute_group *groups[] = { grp, NULL };
+
+	return device_remove_groups(dev, groups);
+}
+
+extern int __must_check devm_device_add_groups(struct device *dev,
+					const struct attribute_group **groups);
+extern void devm_device_remove_groups(struct device *dev,
+				      const struct attribute_group **groups);
+extern int __must_check devm_device_add_group(struct device *dev,
+					const struct attribute_group *grp);
+extern void devm_device_remove_group(struct device *dev,
+				     const struct attribute_group *grp);
+
 /*
  * Platform "fixup" functions - allow the platform to have their say
  * about devices and actions that the general device layer doesn't

include/linux/kobject.h

@@ -57,6 +57,8 @@ enum kobject_action {
 	KOBJ_MOVE,
 	KOBJ_ONLINE,
 	KOBJ_OFFLINE,
+	KOBJ_BIND,
+	KOBJ_UNBIND,
 	KOBJ_MAX
 };
 

include/linux/mod_devicetable.h

@@ -674,8 +674,6 @@ struct ulpi_device_id {
  * struct fsl_mc_device_id - MC object device identifier
  * @vendor: vendor ID
  * @obj_type: MC object type
- * @ver_major: MC object version major number
- * @ver_minor: MC object version minor number
  *
  * Type of entries in the "device Id" table for MC object devices supported by
  * a MC object device driver. The last entry of the table has vendor set to 0x0

lib/kobject_uevent.c

@@ -52,6 +52,8 @@ static const char *kobject_actions[] = {
 	[KOBJ_MOVE] =		"move",
 	[KOBJ_ONLINE] =		"online",
 	[KOBJ_OFFLINE] =	"offline",
+	[KOBJ_BIND] =		"bind",
+	[KOBJ_UNBIND] =		"unbind",
 };
 
 static int kobject_action_type(const char *buf, size_t count,

lib/test_firmware.c

@@ -19,10 +19,85 @@
 #include <linux/miscdevice.h>
 #include <linux/slab.h>
 #include <linux/uaccess.h>
+#include <linux/delay.h>
+#include <linux/kthread.h>
+
+#define TEST_FIRMWARE_NAME	"test-firmware.bin"
+#define TEST_FIRMWARE_NUM_REQS	4
 
 static DEFINE_MUTEX(test_fw_mutex);
 static const struct firmware *test_firmware;
 
+struct test_batched_req {
+	u8 idx;
+	int rc;
+	bool sent;
+	const struct firmware *fw;
+	const char *name;
+	struct completion completion;
+	struct task_struct *task;
+	struct device *dev;
+};
+
+/**
+ * test_config - represents configuration for the test for different triggers
+ *
+ * @name: the name of the firmware file to look for
+ * @sync_direct: when the sync trigger is used if this is true
+ *	request_firmware_direct() will be used instead.
+ * @send_uevent: whether or not to send a uevent for async requests
+ * @num_requests: number of requests to try per test case. This is trigger
+ *	specific.
+ * @reqs: stores all requests information
+ * @read_fw_idx: index of thread from which we want to read firmware results
+ *	from through the read_fw trigger.
+ * @test_result: a test may use this to collect the result from the call
+ *	of the request_firmware*() calls used in their tests. In order of
+ *	priority we always keep first any setup error. If no setup errors were
+ *	found then we move on to the first error encountered while running the
+ *	API. Note that for async calls this typically will be a successful
+ *	result (0) unless of course you've used bogus parameters, or the system
+ *	is out of memory.  In the async case the callback is expected to do a
+ *	bit more homework to figure out what happened, unfortunately the only
+ *	information passed today on error is the fact that no firmware was
+ *	found so we can only assume -ENOENT on async calls if the firmware is
+ *	NULL.
+ *
+ *	Errors you can expect:
+ *
+ *	API specific:
+ *
+ *	0:		success for sync, for async it means request was sent
+ *	-EINVAL:	invalid parameters or request
+ *	-ENOENT:	files not found
+ *
+ *	System environment:
+ *
+ *	-ENOMEM:	memory pressure on system
+ *	-ENODEV:	out of number of devices to test
+ *	-EINVAL:	an unexpected error has occurred
+ * @req_firmware: if @sync_direct is true this is set to
+ *	request_firmware_direct(), otherwise request_firmware()
+ */
+struct test_config {
+	char *name;
+	bool sync_direct;
+	bool send_uevent;
+	u8 num_requests;
+	u8 read_fw_idx;
+
+	/*
+	 * These below don't belong her but we'll move them once we create
+	 * a struct fw_test_device and stuff the misc_dev under there later.
+	 */
+	struct test_batched_req *reqs;
+	int test_result;
+	int (*req_firmware)(const struct firmware **fw, const char *name,
+			    struct device *device);
+};
+
+struct test_config *test_fw_config;
+
 static ssize_t test_fw_misc_read(struct file *f, char __user *buf,
 				 size_t size, loff_t *offset)
 {
@@ -42,6 +117,338 @@ static const struct file_operations test_fw_fops = {
 	.read           = test_fw_misc_read,
 };
 
+static void __test_release_all_firmware(void)
+{
+	struct test_batched_req *req;
+	u8 i;
+
+	if (!test_fw_config->reqs)
+		return;
+
+	for (i = 0; i < test_fw_config->num_requests; i++) {
+		req = &test_fw_config->reqs[i];
+		if (req->fw)
+			release_firmware(req->fw);
+	}
+
+	vfree(test_fw_config->reqs);
+	test_fw_config->reqs = NULL;
+}
+
+static void test_release_all_firmware(void)
+{
+	mutex_lock(&test_fw_mutex);
+	__test_release_all_firmware();
+	mutex_unlock(&test_fw_mutex);
+}
+
+
+static void __test_firmware_config_free(void)
+{
+	__test_release_all_firmware();
+	kfree_const(test_fw_config->name);
+	test_fw_config->name = NULL;
+}
+
+/*
+ * XXX: move to kstrncpy() once merged.
+ *
+ * Users should use kfree_const() when freeing these.
+ */
+static int __kstrncpy(char **dst, const char *name, size_t count, gfp_t gfp)
+{
+	*dst = kstrndup(name, count, gfp);
+	if (!*dst)
+		return -ENOSPC;
+	return count;
+}
+
+static int __test_firmware_config_init(void)
+{
+	int ret;
+
+	ret = __kstrncpy(&test_fw_config->name, TEST_FIRMWARE_NAME,
+			 strlen(TEST_FIRMWARE_NAME), GFP_KERNEL);
+	if (ret < 0)
+		goto out;
+
+	test_fw_config->num_requests = TEST_FIRMWARE_NUM_REQS;
+	test_fw_config->send_uevent = true;
+	test_fw_config->sync_direct = false;
+	test_fw_config->req_firmware = request_firmware;
+	test_fw_config->test_result = 0;
+	test_fw_config->reqs = NULL;
+
+	return 0;
+
+out:
+	__test_firmware_config_free();
+	return ret;
+}
+
+static ssize_t reset_store(struct device *dev,
+			   struct device_attribute *attr,
+			   const char *buf, size_t count)
+{
+	int ret;
+
+	mutex_lock(&test_fw_mutex);
+
+	__test_firmware_config_free();
+
+	ret = __test_firmware_config_init();
+	if (ret < 0) {
+		ret = -ENOMEM;
+		pr_err("could not alloc settings for config trigger: %d\n",
+		       ret);
+		goto out;
+	}
+
+	pr_info("reset\n");
+	ret = count;
+
+out:
+	mutex_unlock(&test_fw_mutex);
+
+	return ret;
+}
+static DEVICE_ATTR_WO(reset);
+
+static ssize_t config_show(struct device *dev,
+			   struct device_attribute *attr,
+			   char *buf)
+{
+	int len = 0;
+
+	mutex_lock(&test_fw_mutex);
+
+	len += snprintf(buf, PAGE_SIZE,
+			"Custom trigger configuration for: %s\n",
+			dev_name(dev));
+
+	if (test_fw_config->name)
+		len += snprintf(buf+len, PAGE_SIZE,
+				"name:\t%s\n",
+				test_fw_config->name);
+	else
+		len += snprintf(buf+len, PAGE_SIZE,
+				"name:\tEMTPY\n");
+
+	len += snprintf(buf+len, PAGE_SIZE,
+			"num_requests:\t%u\n", test_fw_config->num_requests);
+
+	len += snprintf(buf+len, PAGE_SIZE,
+			"send_uevent:\t\t%s\n",
+			test_fw_config->send_uevent ?
+			"FW_ACTION_HOTPLUG" :
+			"FW_ACTION_NOHOTPLUG");
+	len += snprintf(buf+len, PAGE_SIZE,
+			"sync_direct:\t\t%s\n",
+			test_fw_config->sync_direct ? "true" : "false");
+	len += snprintf(buf+len, PAGE_SIZE,
+			"read_fw_idx:\t%u\n", test_fw_config->read_fw_idx);
+
+	mutex_unlock(&test_fw_mutex);
+
+	return len;
+}
+static DEVICE_ATTR_RO(config);
+
+static ssize_t config_name_store(struct device *dev,
+				 struct device_attribute *attr,
+				 const char *buf, size_t count)
+{
+	int ret;
+
+	mutex_lock(&test_fw_mutex);
+	kfree_const(test_fw_config->name);
+	ret = __kstrncpy(&test_fw_config->name, buf, count, GFP_KERNEL);
+	mutex_unlock(&test_fw_mutex);
+
+	return ret;
+}
+
+/*
+ * As per sysfs_kf_seq_show() the buf is max PAGE_SIZE.
+ */
+static ssize_t config_test_show_str(char *dst,
+				    char *src)
+{
+	int len;
+
+	mutex_lock(&test_fw_mutex);
+	len = snprintf(dst, PAGE_SIZE, "%s\n", src);
+	mutex_unlock(&test_fw_mutex);
+
+	return len;
+}
+
+static int test_dev_config_update_bool(const char *buf, size_t size,
+				       bool *cfg)
+{
+	int ret;
+
+	mutex_lock(&test_fw_mutex);
+	if (strtobool(buf, cfg) < 0)
+		ret = -EINVAL;
+	else
+		ret = size;
+	mutex_unlock(&test_fw_mutex);
+
+	return ret;
+}
+
+static ssize_t
+test_dev_config_show_bool(char *buf,
+			  bool config)
+{
+	bool val;
+
+	mutex_lock(&test_fw_mutex);
+	val = config;
+	mutex_unlock(&test_fw_mutex);
+
+	return snprintf(buf, PAGE_SIZE, "%d\n", val);
+}
+
+static ssize_t test_dev_config_show_int(char *buf, int cfg)
+{
+	int val;
+
+	mutex_lock(&test_fw_mutex);
+	val = cfg;
+	mutex_unlock(&test_fw_mutex);
+
+	return snprintf(buf, PAGE_SIZE, "%d\n", val);
+}
+
+static int test_dev_config_update_u8(const char *buf, size_t size, u8 *cfg)
+{
+	int ret;
+	long new;
+
+	ret = kstrtol(buf, 10, &new);
+	if (ret)
+		return ret;
+
+	if (new > U8_MAX)
+		return -EINVAL;
+
+	mutex_lock(&test_fw_mutex);
+	*(u8 *)cfg = new;
+	mutex_unlock(&test_fw_mutex);
+
+	/* Always return full write size even if we didn't consume all */
+	return size;
+}
+
+static ssize_t test_dev_config_show_u8(char *buf, u8 cfg)
+{
+	u8 val;
+
+	mutex_lock(&test_fw_mutex);
+	val = cfg;
+	mutex_unlock(&test_fw_mutex);
+
+	return snprintf(buf, PAGE_SIZE, "%u\n", val);
+}
+
+static ssize_t config_name_show(struct device *dev,
+				struct device_attribute *attr,
+				char *buf)
+{
+	return config_test_show_str(buf, test_fw_config->name);
+}
+static DEVICE_ATTR(config_name, 0644, config_name_show, config_name_store);
+
+static ssize_t config_num_requests_store(struct device *dev,
+					 struct device_attribute *attr,
+					 const char *buf, size_t count)
+{
+	int rc;
+
+	mutex_lock(&test_fw_mutex);
+	if (test_fw_config->reqs) {
+		pr_err("Must call release_all_firmware prior to changing config\n");
+		rc = -EINVAL;
+		goto out;
+	}
+	mutex_unlock(&test_fw_mutex);
+
+	rc = test_dev_config_update_u8(buf, count,
+				       &test_fw_config->num_requests);
+
+out:
+	return rc;
+}
+
+static ssize_t config_num_requests_show(struct device *dev,
+					struct device_attribute *attr,
+					char *buf)
+{
+	return test_dev_config_show_u8(buf, test_fw_config->num_requests);
+}
+static DEVICE_ATTR(config_num_requests, 0644, config_num_requests_show,
+		   config_num_requests_store);
+
+static ssize_t config_sync_direct_store(struct device *dev,
+					struct device_attribute *attr,
+					const char *buf, size_t count)
+{
+	int rc = test_dev_config_update_bool(buf, count,
+					     &test_fw_config->sync_direct);
+
+	if (rc == count)
+		test_fw_config->req_firmware = test_fw_config->sync_direct ?
+				       request_firmware_direct :
+				       request_firmware;
+	return rc;
+}
+
+static ssize_t config_sync_direct_show(struct device *dev,
+				       struct device_attribute *attr,
+				       char *buf)
+{
+	return test_dev_config_show_bool(buf, test_fw_config->sync_direct);
+}
+static DEVICE_ATTR(config_sync_direct, 0644, config_sync_direct_show,
+		   config_sync_direct_store);
+
+static ssize_t config_send_uevent_store(struct device *dev,
+					struct device_attribute *attr,
+					const char *buf, size_t count)
+{
+	return test_dev_config_update_bool(buf, count,
+					   &test_fw_config->send_uevent);
+}
+
+static ssize_t config_send_uevent_show(struct device *dev,
+				       struct device_attribute *attr,
+				       char *buf)
+{
+	return test_dev_config_show_bool(buf, test_fw_config->send_uevent);
+}
+static DEVICE_ATTR(config_send_uevent, 0644, config_send_uevent_show,
+		   config_send_uevent_store);
+
+static ssize_t config_read_fw_idx_store(struct device *dev,
+					struct device_attribute *attr,
+					const char *buf, size_t count)
+{
+	return test_dev_config_update_u8(buf, count,
+					 &test_fw_config->read_fw_idx);
+}
+
+static ssize_t config_read_fw_idx_show(struct device *dev,
+				       struct device_attribute *attr,
+				       char *buf)
+{
+	return test_dev_config_show_u8(buf, test_fw_config->read_fw_idx);
+}
+static DEVICE_ATTR(config_read_fw_idx, 0644, config_read_fw_idx_show,
+		   config_read_fw_idx_store);
+
+
 static ssize_t trigger_request_store(struct device *dev,
 				     struct device_attribute *attr,
 				     const char *buf, size_t count)
@@ -170,12 +577,301 @@ static ssize_t trigger_custom_fallback_store(struct device *dev,
 }
 static DEVICE_ATTR_WO(trigger_custom_fallback);
 
+static int test_fw_run_batch_request(void *data)
+{
+	struct test_batched_req *req = data;
+
+	if (!req) {
+		test_fw_config->test_result = -EINVAL;
+		return -EINVAL;
+	}
+
+	req->rc = test_fw_config->req_firmware(&req->fw, req->name, req->dev);
+	if (req->rc) {
+		pr_info("#%u: batched sync load failed: %d\n",
+			req->idx, req->rc);
+		if (!test_fw_config->test_result)
+			test_fw_config->test_result = req->rc;
+	} else if (req->fw) {
+		req->sent = true;
+		pr_info("#%u: batched sync loaded %zu\n",
+			req->idx, req->fw->size);
+	}
+	complete(&req->completion);
+
+	req->task = NULL;
+
+	return 0;
+}
+
+/*
+ * We use a kthread as otherwise the kernel serializes all our sync requests
+ * and we would not be able to mimic batched requests on a sync call. Batched
+ * requests on a sync call can for instance happen on a device driver when
+ * multiple cards are used and firmware loading happens outside of probe.
+ */
+static ssize_t trigger_batched_requests_store(struct device *dev,
+					      struct device_attribute *attr,
+					      const char *buf, size_t count)
+{
+	struct test_batched_req *req;
+	int rc;
+	u8 i;
+
+	mutex_lock(&test_fw_mutex);
+
+	test_fw_config->reqs = vzalloc(sizeof(struct test_batched_req) *
+				       test_fw_config->num_requests * 2);
+	if (!test_fw_config->reqs) {
+		rc = -ENOMEM;
+		goto out_unlock;
+	}
+
+	pr_info("batched sync firmware loading '%s' %u times\n",
+		test_fw_config->name, test_fw_config->num_requests);
+
+	for (i = 0; i < test_fw_config->num_requests; i++) {
+		req = &test_fw_config->reqs[i];
+		if (!req) {
+			WARN_ON(1);
+			rc = -ENOMEM;
+			goto out_bail;
+		}
+		req->fw = NULL;
+		req->idx = i;
+		req->name = test_fw_config->name;
+		req->dev = dev;
+		init_completion(&req->completion);
+		req->task = kthread_run(test_fw_run_batch_request, req,
+					     "%s-%u", KBUILD_MODNAME, req->idx);
+		if (!req->task || IS_ERR(req->task)) {
+			pr_err("Setting up thread %u failed\n", req->idx);
+			req->task = NULL;
+			rc = -ENOMEM;
+			goto out_bail;
+		}
+	}
+
+	rc = count;
+
+	/*
+	 * We require an explicit release to enable more time and delay of
+	 * calling release_firmware() to improve our chances of forcing a
+	 * batched request. If we instead called release_firmware() right away
+	 * then we might miss on an opportunity of having a successful firmware
+	 * request pass on the opportunity to be come a batched request.
+	 */
+
+out_bail:
+	for (i = 0; i < test_fw_config->num_requests; i++) {
+		req = &test_fw_config->reqs[i];
+		if (req->task || req->sent)
+			wait_for_completion(&req->completion);
+	}
+
+	/* Override any worker error if we had a general setup error */
+	if (rc < 0)
+		test_fw_config->test_result = rc;
+
+out_unlock:
+	mutex_unlock(&test_fw_mutex);
+
+	return rc;
+}
+static DEVICE_ATTR_WO(trigger_batched_requests);
+
+/*
+ * We wait for each callback to return with the lock held, no need to lock here
+ */
+static void trigger_batched_cb(const struct firmware *fw, void *context)
+{
+	struct test_batched_req *req = context;
+
+	if (!req) {
+		test_fw_config->test_result = -EINVAL;
+		return;
+	}
+
+	/* forces *some* batched requests to queue up */
+	if (!req->idx)
+		ssleep(2);
+
+	req->fw = fw;
+
+	/*
+	 * Unfortunately the firmware API gives us nothing other than a null FW
+	 * if the firmware was not found on async requests.  Best we can do is
+	 * just assume -ENOENT. A better API would pass the actual return
+	 * value to the callback.
+	 */
+	if (!fw && !test_fw_config->test_result)
+		test_fw_config->test_result = -ENOENT;
+
+	complete(&req->completion);
+}
+
+static
+ssize_t trigger_batched_requests_async_store(struct device *dev,
+					     struct device_attribute *attr,
+					     const char *buf, size_t count)
+{
+	struct test_batched_req *req;
+	bool send_uevent;
+	int rc;
+	u8 i;
+
+	mutex_lock(&test_fw_mutex);
+
+	test_fw_config->reqs = vzalloc(sizeof(struct test_batched_req) *
+				       test_fw_config->num_requests * 2);
+	if (!test_fw_config->reqs) {
+		rc = -ENOMEM;
+		goto out;
+	}
+
+	pr_info("batched loading '%s' custom fallback mechanism %u times\n",
+		test_fw_config->name, test_fw_config->num_requests);
+
+	send_uevent = test_fw_config->send_uevent ? FW_ACTION_HOTPLUG :
+		FW_ACTION_NOHOTPLUG;
+
+	for (i = 0; i < test_fw_config->num_requests; i++) {
+		req = &test_fw_config->reqs[i];
+		if (!req) {
+			WARN_ON(1);
+			goto out_bail;
+		}
+		req->name = test_fw_config->name;
+		req->fw = NULL;
+		req->idx = i;
+		init_completion(&req->completion);
+		rc = request_firmware_nowait(THIS_MODULE, send_uevent,
+					     req->name,
+					     dev, GFP_KERNEL, req,
+					     trigger_batched_cb);
+		if (rc) {
+			pr_info("#%u: batched async load failed setup: %d\n",
+				i, rc);
+			req->rc = rc;
+			goto out_bail;
+		} else
+			req->sent = true;
+	}
+
+	rc = count;
+
+out_bail:
+
+	/*
+	 * We require an explicit release to enable more time and delay of
+	 * calling release_firmware() to improve our chances of forcing a
+	 * batched request. If we instead called release_firmware() right away
+	 * then we might miss on an opportunity of having a successful firmware
+	 * request pass on the opportunity to be come a batched request.
+	 */
+
+	for (i = 0; i < test_fw_config->num_requests; i++) {
+		req = &test_fw_config->reqs[i];
+		if (req->sent)
+			wait_for_completion(&req->completion);
+	}
+
+	/* Override any worker error if we had a general setup error */
+	if (rc < 0)
+		test_fw_config->test_result = rc;
+
+out:
+	mutex_unlock(&test_fw_mutex);
+
+	return rc;
+}
+static DEVICE_ATTR_WO(trigger_batched_requests_async);
+
+static ssize_t test_result_show(struct device *dev,
+				struct device_attribute *attr,
+				char *buf)
+{
+	return test_dev_config_show_int(buf, test_fw_config->test_result);
+}
+static DEVICE_ATTR_RO(test_result);
+
+static ssize_t release_all_firmware_store(struct device *dev,
+					  struct device_attribute *attr,
+					  const char *buf, size_t count)
+{
+	test_release_all_firmware();
+	return count;
+}
+static DEVICE_ATTR_WO(release_all_firmware);
+
+static ssize_t read_firmware_show(struct device *dev,
+				  struct device_attribute *attr,
+				  char *buf)
+{
+	struct test_batched_req *req;
+	u8 idx;
+	ssize_t rc = 0;
+
+	mutex_lock(&test_fw_mutex);
+
+	idx = test_fw_config->read_fw_idx;
+	if (idx >= test_fw_config->num_requests) {
+		rc = -ERANGE;
+		goto out;
+	}
+
+	if (!test_fw_config->reqs) {
+		rc = -EINVAL;
+		goto out;
+	}
+
+	req = &test_fw_config->reqs[idx];
+	if (!req->fw) {
+		pr_err("#%u: failed to async load firmware\n", idx);
+		rc = -ENOENT;
+		goto out;
+	}
+
+	pr_info("#%u: loaded %zu\n", idx, req->fw->size);
+
+	if (req->fw->size > PAGE_SIZE) {
+		pr_err("Testing interface must use PAGE_SIZE firmware for now\n");
+		rc = -EINVAL;
+	}
+	memcpy(buf, req->fw->data, req->fw->size);
+
+	rc = req->fw->size;
+out:
+	mutex_unlock(&test_fw_mutex);
+
+	return rc;
+}
+static DEVICE_ATTR_RO(read_firmware);
+
 #define TEST_FW_DEV_ATTR(name)          &dev_attr_##name.attr
 
 static struct attribute *test_dev_attrs[] = {
+	TEST_FW_DEV_ATTR(reset),
+
+	TEST_FW_DEV_ATTR(config),
+	TEST_FW_DEV_ATTR(config_name),
+	TEST_FW_DEV_ATTR(config_num_requests),
+	TEST_FW_DEV_ATTR(config_sync_direct),
+	TEST_FW_DEV_ATTR(config_send_uevent),
+	TEST_FW_DEV_ATTR(config_read_fw_idx),
+
+	/* These don't use the config at all - they could be ported! */
 	TEST_FW_DEV_ATTR(trigger_request),
 	TEST_FW_DEV_ATTR(trigger_async_request),
 	TEST_FW_DEV_ATTR(trigger_custom_fallback),
+
+	/* These use the config and can use the test_result */
+	TEST_FW_DEV_ATTR(trigger_batched_requests),
+	TEST_FW_DEV_ATTR(trigger_batched_requests_async),
+
+	TEST_FW_DEV_ATTR(release_all_firmware),
+	TEST_FW_DEV_ATTR(test_result),
+	TEST_FW_DEV_ATTR(read_firmware),
 	NULL,
 };
 
@@ -192,8 +888,17 @@ static int __init test_firmware_init(void)
 {
 	int rc;
 
+	test_fw_config = kzalloc(sizeof(struct test_config), GFP_KERNEL);
+	if (!test_fw_config)
+		return -ENOMEM;
+
+	rc = __test_firmware_config_init();
+	if (rc)
+		return rc;
+
 	rc = misc_register(&test_fw_misc_device);
 	if (rc) {
+		kfree(test_fw_config);
 		pr_err("could not register misc device: %d\n", rc);
 		return rc;
 	}
@@ -207,8 +912,13 @@ module_init(test_firmware_init);
 
 static void __exit test_firmware_exit(void)
 {
+	mutex_lock(&test_fw_mutex);
 	release_firmware(test_firmware);
 	misc_deregister(&test_fw_misc_device);
+	__test_firmware_config_free();
+	kfree(test_fw_config);
+	mutex_unlock(&test_fw_mutex);
+
 	pr_warn("removed interface\n");
 }
 

tools/testing/selftests/firmware/fw_fallback.sh

@@ -134,6 +134,27 @@ load_fw_custom_cancel()
 	wait
 }
 
+load_fw_fallback_with_child()
+{
+	local name="$1"
+	local file="$2"
+
+	# This is the value already set but we want to be explicit
+	echo 4 >/sys/class/firmware/timeout
+
+	sleep 1 &
+	SECONDS_BEFORE=$(date +%s)
+	echo -n "$name" >"$DIR"/trigger_request 2>/dev/null
+	SECONDS_AFTER=$(date +%s)
+	SECONDS_DELTA=$(($SECONDS_AFTER - $SECONDS_BEFORE))
+	if [ "$SECONDS_DELTA" -lt 4 ]; then
+		RET=1
+	else
+		RET=0
+	fi
+	wait
+	return $RET
+}
 
 trap "test_finish" EXIT
 
@@ -221,4 +242,14 @@ else
 	echo "$0: cancelling custom fallback mechanism works"
 fi
 
+set +e
+load_fw_fallback_with_child "nope-signal-$NAME" "$FW"
+if [ "$?" -eq 0 ]; then
+	echo "$0: SIGCHLD on sync ignored as expected" >&2
+else
+	echo "$0: error - sync firmware request cancelled due to SIGCHLD" >&2
+	exit 1
+fi
+set -e
+
 exit 0

tools/testing/selftests/firmware/fw_filesystem.sh

@@ -25,8 +25,9 @@ if [ ! -d $DIR ]; then
 fi
 
 # CONFIG_FW_LOADER_USER_HELPER has a sysfs class under /sys/class/firmware/
-# These days no one enables CONFIG_FW_LOADER_USER_HELPER so check for that
-# as an indicator for CONFIG_FW_LOADER_USER_HELPER.
+# These days most distros enable CONFIG_FW_LOADER_USER_HELPER but disable
+# CONFIG_FW_LOADER_USER_HELPER_FALLBACK. We use /sys/class/firmware/ as an
+# indicator for CONFIG_FW_LOADER_USER_HELPER.
 HAS_FW_LOADER_USER_HELPER=$(if [ -d /sys/class/firmware/ ]; then echo yes; else echo no; fi)
 
 if [ "$HAS_FW_LOADER_USER_HELPER" = "yes" ]; then
@@ -116,4 +117,240 @@ else
 	echo "$0: async filesystem loading works"
 fi
 
+### Batched requests tests
+test_config_present()
+{
+	if [ ! -f $DIR/reset ]; then
+		echo "Configuration triggers not present, ignoring test"
+		exit 0
+	fi
+}
+
+# Defaults :
+#
+# send_uevent: 1
+# sync_direct: 0
+# name: test-firmware.bin
+# num_requests: 4
+config_reset()
+{
+	echo 1 >  $DIR/reset
+}
+
+release_all_firmware()
+{
+	echo 1 >  $DIR/release_all_firmware
+}
+
+config_set_name()
+{
+	echo -n $1 >  $DIR/config_name
+}
+
+config_set_sync_direct()
+{
+	echo 1 >  $DIR/config_sync_direct
+}
+
+config_unset_sync_direct()
+{
+	echo 0 >  $DIR/config_sync_direct
+}
+
+config_set_uevent()
+{
+	echo 1 >  $DIR/config_send_uevent
+}
+
+config_unset_uevent()
+{
+	echo 0 >  $DIR/config_send_uevent
+}
+
+config_trigger_sync()
+{
+	echo -n 1 > $DIR/trigger_batched_requests 2>/dev/null
+}
+
+config_trigger_async()
+{
+	echo -n 1 > $DIR/trigger_batched_requests_async 2> /dev/null
+}
+
+config_set_read_fw_idx()
+{
+	echo -n $1 > $DIR/config_read_fw_idx 2> /dev/null
+}
+
+read_firmwares()
+{
+	for i in $(seq 0 3); do
+		config_set_read_fw_idx $i
+		# Verify the contents are what we expect.
+		# -Z required for now -- check for yourself, md5sum
+		# on $FW and DIR/read_firmware will yield the same. Even
+		# cmp agrees, so something is off.
+		if ! diff -q -Z "$FW" $DIR/read_firmware 2>/dev/null ; then
+			echo "request #$i: firmware was not loaded" >&2
+			exit 1
+		fi
+	done
+}
+
+read_firmwares_expect_nofile()
+{
+	for i in $(seq 0 3); do
+		config_set_read_fw_idx $i
+		# Ensures contents differ
+		if diff -q -Z "$FW" $DIR/read_firmware 2>/dev/null ; then
+			echo "request $i: file was not expected to match" >&2
+			exit 1
+		fi
+	done
+}
+
+test_batched_request_firmware_nofile()
+{
+	echo -n "Batched request_firmware() nofile try #$1: "
+	config_reset
+	config_set_name nope-test-firmware.bin
+	config_trigger_sync
+	read_firmwares_expect_nofile
+	release_all_firmware
+	echo "OK"
+}
+
+test_batched_request_firmware_direct_nofile()
+{
+	echo -n "Batched request_firmware_direct() nofile try #$1: "
+	config_reset
+	config_set_name nope-test-firmware.bin
+	config_set_sync_direct
+	config_trigger_sync
+	release_all_firmware
+	echo "OK"
+}
+
+test_request_firmware_nowait_uevent_nofile()
+{
+	echo -n "Batched request_firmware_nowait(uevent=true) nofile try #$1: "
+	config_reset
+	config_set_name nope-test-firmware.bin
+	config_trigger_async
+	release_all_firmware
+	echo "OK"
+}
+
+test_wait_and_cancel_custom_load()
+{
+	if [ "$HAS_FW_LOADER_USER_HELPER" != "yes" ]; then
+		return
+	fi
+	local timeout=10
+	name=$1
+	while [ ! -e "$DIR"/"$name"/loading ]; do
+		sleep 0.1
+		timeout=$(( $timeout - 1 ))
+		if [ "$timeout" -eq 0 ]; then
+			echo "firmware interface never appeared:" >&2
+			echo "$DIR/$name/loading" >&2
+			exit 1
+		fi
+	done
+	echo -1 >"$DIR"/"$name"/loading
+}
+
+test_request_firmware_nowait_custom_nofile()
+{
+	echo -n "Batched request_firmware_nowait(uevent=false) nofile try #$1: "
+	config_unset_uevent
+	config_set_name nope-test-firmware.bin
+	config_trigger_async &
+	test_wait_and_cancel_custom_load nope-test-firmware.bin
+	wait
+	release_all_firmware
+	echo "OK"
+}
+
+test_batched_request_firmware()
+{
+	echo -n "Batched request_firmware() try #$1: "
+	config_reset
+	config_trigger_sync
+	read_firmwares
+	release_all_firmware
+	echo "OK"
+}
+
+test_batched_request_firmware_direct()
+{
+	echo -n "Batched request_firmware_direct() try #$1: "
+	config_reset
+	config_set_sync_direct
+	config_trigger_sync
+	release_all_firmware
+	echo "OK"
+}
+
+test_request_firmware_nowait_uevent()
+{
+	echo -n "Batched request_firmware_nowait(uevent=true) try #$1: "
+	config_reset
+	config_trigger_async
+	release_all_firmware
+	echo "OK"
+}
+
+test_request_firmware_nowait_custom()
+{
+	echo -n "Batched request_firmware_nowait(uevent=false) try #$1: "
+	config_unset_uevent
+	config_trigger_async
+	release_all_firmware
+	echo "OK"
+}
+
+# Only continue if batched request triggers are present on the
+# test-firmware driver
+test_config_present
+
+# test with the file present
+echo
+echo "Testing with the file present..."
+for i in $(seq 1 5); do
+	test_batched_request_firmware $i
+done
+
+for i in $(seq 1 5); do
+	test_batched_request_firmware_direct $i
+done
+
+for i in $(seq 1 5); do
+	test_request_firmware_nowait_uevent $i
+done
+
+for i in $(seq 1 5); do
+	test_request_firmware_nowait_custom $i
+done
+
+# Test for file not found, errors are expected, the failure would be
+# a hung task, which would require a hard reset.
+echo
+echo "Testing with the file missing..."
+for i in $(seq 1 5); do
+	test_batched_request_firmware_nofile $i
+done
+
+for i in $(seq 1 5); do
+	test_batched_request_firmware_direct_nofile $i
+done
+
+for i in $(seq 1 5); do
+	test_request_firmware_nowait_uevent_nofile $i
+done
+
+for i in $(seq 1 5); do
+	test_request_firmware_nowait_custom_nofile $i
+done
+
 exit 0