Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6

* git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6: (27 commits)
  Driver core: fix race in dev_driver_string
  Driver Core: Early platform driver buffer
  sysfs: sysfs_setattr remove unnecessary permission check.
  sysfs: Factor out sysfs_rename from sysfs_rename_dir and sysfs_move_dir
  sysfs: Propagate renames to the vfs on demand
  sysfs: Gut sysfs_addrm_start and sysfs_addrm_finish
  sysfs: In sysfs_chmod_file lazily propagate the mode change.
  sysfs: Implement sysfs_getattr & sysfs_permission
  sysfs: Nicely indent sysfs_symlink_inode_operations
  sysfs: Update s_iattr on link and unlink.
  sysfs: Fix locking and factor out sysfs_sd_setattr
  sysfs: Simplify iattr time assignments
  sysfs: Simplify sysfs_chmod_file semantics
  sysfs: Use dentry_ops instead of directly playing with the dcache
  sysfs: Rename sysfs_d_iput to sysfs_dentry_iput
  sysfs: Update sysfs_setxattr so it updates secdata under the sysfs_mutex
  debugfs: fix create mutex racy fops and private data
  Driver core: Don't remove kobjects in device_shutdown.
  firmware_class: make request_firmware_nowait more useful
  Driver-Core: devtmpfs - set root directory mode to 0755
  ...

drivers/base/core.c

@@ -56,7 +56,14 @@ static inline int device_is_not_partition(struct device *dev)
  */
 const char *dev_driver_string(const struct device *dev)
 {
-	return dev->driver ? dev->driver->name :
+	struct device_driver *drv;
+
+	/* dev->driver can change to NULL underneath us because of unbinding,
+	 * so be careful about accessing it.  dev->bus and dev->class should
+	 * never change once they are set, so they don't need special care.
+	 */
+	drv = ACCESS_ONCE(dev->driver);
+	return drv ? drv->name :
 			(dev->bus ? dev->bus->name :
 			(dev->class ? dev->class->name : ""));
 }
@@ -986,6 +993,8 @@ int device_add(struct device *dev)
  AttrsError:
 	device_remove_class_symlinks(dev);
  SymlinkError:
+	if (MAJOR(dev->devt))
+		devtmpfs_delete_node(dev);
 	if (MAJOR(dev->devt))
 		device_remove_sys_dev_entry(dev);
  devtattrError:
@@ -1728,8 +1737,5 @@ void device_shutdown(void)
 			dev->driver->shutdown(dev);
 		}
 	}
-	kobject_put(sysfs_dev_char_kobj);
-	kobject_put(sysfs_dev_block_kobj);
-	kobject_put(dev_kobj);
 	async_synchronize_full();
 }

drivers/base/devtmpfs.c

@@ -32,6 +32,8 @@ static int dev_mount = 1;
 static int dev_mount;
 #endif
 
+static rwlock_t dirlock;
+
 static int __init mount_param(char *str)
 {
 	dev_mount = simple_strtoul(str, NULL, 0);
@@ -74,47 +76,35 @@ static int dev_mkdir(const char *name, mode_t mode)
 	dentry = lookup_create(&nd, 1);
 	if (!IS_ERR(dentry)) {
 		err = vfs_mkdir(nd.path.dentry->d_inode, dentry, mode);
+		if (!err)
+			/* mark as kernel-created inode */
+			dentry->d_inode->i_private = &dev_mnt;
 		dput(dentry);
 	} else {
 		err = PTR_ERR(dentry);
 	}
-	mutex_unlock(&nd.path.dentry->d_inode->i_mutex);
 
+	mutex_unlock(&nd.path.dentry->d_inode->i_mutex);
 	path_put(&nd.path);
 	return err;
 }
 
 static int create_path(const char *nodepath)
 {
-	char *path;
-	struct nameidata nd;
-	int err = 0;
-
-	path = kstrdup(nodepath, GFP_KERNEL);
-	if (!path)
-		return -ENOMEM;
-
-	err = vfs_path_lookup(dev_mnt->mnt_root, dev_mnt,
-			      path, LOOKUP_PARENT, &nd);
-	if (err == 0) {
-		struct dentry *dentry;
-
-		/* create directory right away */
-		dentry = lookup_create(&nd, 1);
-		if (!IS_ERR(dentry)) {
-			err = vfs_mkdir(nd.path.dentry->d_inode,
-					dentry, 0755);
-			dput(dentry);
-		}
-		mutex_unlock(&nd.path.dentry->d_inode->i_mutex);
+	int err;
 
-		path_put(&nd.path);
-	} else if (err == -ENOENT) {
+	read_lock(&dirlock);
+	err = dev_mkdir(nodepath, 0755);
+	if (err == -ENOENT) {
+		char *path;
 		char *s;
 
 		/* parent directories do not exist, create them */
+		path = kstrdup(nodepath, GFP_KERNEL);
+		if (!path)
+			return -ENOMEM;
 		s = path;
-		while (1) {
+		for (;;) {
 			s = strchr(s, '/');
 			if (!s)
 				break;
@@ -125,9 +115,9 @@ static int create_path(const char *nodepath)
 			s[0] = '/';
 			s++;
 		}
+		kfree(path);
 	}
-
-	kfree(path);
+	read_unlock(&dirlock);
 	return err;
 }
 
@@ -156,34 +146,40 @@ int devtmpfs_create_node(struct device *dev)
 		mode |= S_IFCHR;
 
 	curr_cred = override_creds(&init_cred);
+
 	err = vfs_path_lookup(dev_mnt->mnt_root, dev_mnt,
 			      nodename, LOOKUP_PARENT, &nd);
 	if (err == -ENOENT) {
-		/* create missing parent directories */
 		create_path(nodename);
 		err = vfs_path_lookup(dev_mnt->mnt_root, dev_mnt,
 				      nodename, LOOKUP_PARENT, &nd);
-		if (err)
-			goto out;
 	}
+	if (err)
+		goto out;
 
 	dentry = lookup_create(&nd, 0);
 	if (!IS_ERR(dentry)) {
-		int umask;
-
-		umask = sys_umask(0000);
 		err = vfs_mknod(nd.path.dentry->d_inode,
 				dentry, mode, dev->devt);
-		sys_umask(umask);
-		/* mark as kernel created inode */
-		if (!err)
+		if (!err) {
+			struct iattr newattrs;
+
+			/* fixup possibly umasked mode */
+			newattrs.ia_mode = mode;
+			newattrs.ia_valid = ATTR_MODE;
+			mutex_lock(&dentry->d_inode->i_mutex);
+			notify_change(dentry, &newattrs);
+			mutex_unlock(&dentry->d_inode->i_mutex);
+
+			/* mark as kernel-created inode */
 			dentry->d_inode->i_private = &dev_mnt;
+		}
 		dput(dentry);
 	} else {
 		err = PTR_ERR(dentry);
 	}
-	mutex_unlock(&nd.path.dentry->d_inode->i_mutex);
 
+	mutex_unlock(&nd.path.dentry->d_inode->i_mutex);
 	path_put(&nd.path);
 out:
 	kfree(tmp);
@@ -205,16 +201,21 @@ static int dev_rmdir(const char *name)
 	mutex_lock_nested(&nd.path.dentry->d_inode->i_mutex, I_MUTEX_PARENT);
 	dentry = lookup_one_len(nd.last.name, nd.path.dentry, nd.last.len);
 	if (!IS_ERR(dentry)) {
-		if (dentry->d_inode)
-			err = vfs_rmdir(nd.path.dentry->d_inode, dentry);
-		else
+		if (dentry->d_inode) {
+			if (dentry->d_inode->i_private == &dev_mnt)
+				err = vfs_rmdir(nd.path.dentry->d_inode,
+						dentry);
+			else
+				err = -EPERM;
+		} else {
 			err = -ENOENT;
+		}
 		dput(dentry);
 	} else {
 		err = PTR_ERR(dentry);
 	}
-	mutex_unlock(&nd.path.dentry->d_inode->i_mutex);
 
+	mutex_unlock(&nd.path.dentry->d_inode->i_mutex);
 	path_put(&nd.path);
 	return err;
 }
@@ -228,7 +229,8 @@ static int delete_path(const char *nodepath)
 	if (!path)
 		return -ENOMEM;
 
-	while (1) {
+	write_lock(&dirlock);
+	for (;;) {
 		char *base;
 
 		base = strrchr(path, '/');
@@ -239,6 +241,7 @@ static int delete_path(const char *nodepath)
 		if (err)
 			break;
 	}
+	write_unlock(&dirlock);
 
 	kfree(path);
 	return err;
@@ -322,9 +325,8 @@ int devtmpfs_delete_node(struct device *dev)
  * If configured, or requested by the commandline, devtmpfs will be
  * auto-mounted after the kernel mounted the root filesystem.
  */
-int devtmpfs_mount(const char *mountpoint)
+int devtmpfs_mount(const char *mntdir)
 {
-	struct path path;
 	int err;
 
 	if (!dev_mount)
@@ -333,15 +335,11 @@ int devtmpfs_mount(const char *mountpoint)
 	if (!dev_mnt)
 		return 0;
 
-	err = kern_path(mountpoint, LOOKUP_FOLLOW, &path);
-	if (err)
-		return err;
-	err = do_add_mount(dev_mnt, &path, 0, NULL);
+	err = sys_mount("devtmpfs", (char *)mntdir, "devtmpfs", MS_SILENT, NULL);
 	if (err)
 		printk(KERN_INFO "devtmpfs: error mounting %i\n", err);
 	else
 		printk(KERN_INFO "devtmpfs: mounted\n");
-	path_put(&path);
 	return err;
 }
 
@@ -354,6 +352,8 @@ int __init devtmpfs_init(void)
 	int err;
 	struct vfsmount *mnt;
 
+	rwlock_init(&dirlock);
+
 	err = register_filesystem(&dev_fs_type);
 	if (err) {
 		printk(KERN_ERR "devtmpfs: unable to register devtmpfs "
@@ -361,7 +361,7 @@ int __init devtmpfs_init(void)
 		return err;
 	}
 
-	mnt = kern_mount(&dev_fs_type);
+	mnt = kern_mount_data(&dev_fs_type, "mode=0755");
 	if (IS_ERR(mnt)) {
 		err = PTR_ERR(mnt);
 		printk(KERN_ERR "devtmpfs: unable to create devtmpfs %i\n", err);

drivers/base/firmware_class.c

@@ -601,12 +601,9 @@ request_firmware_work_func(void *arg)
 	}
 	ret = _request_firmware(&fw, fw_work->name, fw_work->device,
 		fw_work->uevent);
-	if (ret < 0)
-		fw_work->cont(NULL, fw_work->context);
-	else {
-		fw_work->cont(fw, fw_work->context);
-		release_firmware(fw);
-	}
+
+	fw_work->cont(fw, fw_work->context);
+
 	module_put(fw_work->module);
 	kfree(fw_work);
 	return ret;
@@ -619,6 +616,7 @@ request_firmware_work_func(void *arg)
  *	is non-zero else the firmware copy must be done manually.
  * @name: name of firmware file
  * @device: device for which firmware is being loaded
+ * @gfp: allocation flags
  * @context: will be passed over to @cont, and
  *	@fw may be %NULL if firmware request fails.
  * @cont: function will be called asynchronously when the firmware
@@ -631,12 +629,12 @@ request_firmware_work_func(void *arg)
 int
 request_firmware_nowait(
 	struct module *module, int uevent,
-	const char *name, struct device *device, void *context,
+	const char *name, struct device *device, gfp_t gfp, void *context,
 	void (*cont)(const struct firmware *fw, void *context))
 {
 	struct task_struct *task;
 	struct firmware_work *fw_work = kmalloc(sizeof (struct firmware_work),
-						GFP_ATOMIC);
+						gfp);
 
 	if (!fw_work)
 		return -ENOMEM;

drivers/base/platform.c

@@ -1000,7 +1000,7 @@ static __initdata LIST_HEAD(early_platform_device_list);
 int __init early_platform_driver_register(struct early_platform_driver *epdrv,
 					  char *buf)
 {
-	unsigned long index;
+	char *tmp;
 	int n;
 
 	/* Simply add the driver to the end of the global list.
@@ -1019,13 +1019,28 @@ int __init early_platform_driver_register(struct early_platform_driver *epdrv,
 	if (buf && !strncmp(buf, epdrv->pdrv->driver.name, n)) {
 		list_move(&epdrv->list, &early_platform_driver_list);
 
-		if (!strcmp(buf, epdrv->pdrv->driver.name))
+		/* Allow passing parameters after device name */
+		if (buf[n] == '\0' || buf[n] == ',')
 			epdrv->requested_id = -1;
-		else if (buf[n] == '.' && strict_strtoul(&buf[n + 1], 10,
-							 &index) == 0)
-			epdrv->requested_id = index;
-		else
-			epdrv->requested_id = EARLY_PLATFORM_ID_ERROR;
+		else {
+			epdrv->requested_id = simple_strtoul(&buf[n + 1],
+							     &tmp, 10);
+
+			if (buf[n] != '.' || (tmp == &buf[n + 1])) {
+				epdrv->requested_id = EARLY_PLATFORM_ID_ERROR;
+				n = 0;
+			} else
+				n += strcspn(&buf[n + 1], ",") + 1;
+		}
+
+		if (buf[n] == ',')
+			n++;
+
+		if (epdrv->bufsize) {
+			memcpy(epdrv->buffer, &buf[n],
+			       min_t(int, epdrv->bufsize, strlen(&buf[n]) + 1));
+			epdrv->buffer[epdrv->bufsize - 1] = '\0';
+		}
 	}
 
 	return 0;

drivers/firmware/dell_rbu.c

@@ -544,9 +544,12 @@ static void callbackfn_rbu(const struct firmware *fw, void *context)
 {
 	rbu_data.entry_created = 0;
 
-	if (!fw || !fw->size)
+	if (!fw)
 		return;
 
+	if (!fw->size)
+		goto out;
+
 	spin_lock(&rbu_data.lock);
 	if (!strcmp(image_type, "mono")) {
 		if (!img_update_realloc(fw->size))
@@ -568,6 +571,8 @@ static void callbackfn_rbu(const struct firmware *fw, void *context)
 	} else
 		pr_debug("invalid image type specified.\n");
 	spin_unlock(&rbu_data.lock);
+ out:
+	release_firmware(fw);
 }
 
 static ssize_t read_rbu_image_type(struct kobject *kobj,
@@ -615,7 +620,7 @@ static ssize_t write_rbu_image_type(struct kobject *kobj,
 			spin_unlock(&rbu_data.lock);
 			req_firm_rc = request_firmware_nowait(THIS_MODULE,
 				FW_ACTION_NOHOTPLUG, "dell_rbu",
-				&rbu_device->dev, &context,
+				&rbu_device->dev, GFP_KERNEL, &context,
 				callbackfn_rbu);
 			if (req_firm_rc) {
 				printk(KERN_ERR

drivers/misc/hpilo.h

@@ -44,9 +44,20 @@ struct ilo_hwinfo {
 
 	struct pci_dev *ilo_dev;
 
+	/*
+	 * open_lock      serializes ccb_cnt during open and close
+	 * [ irq disabled ]
+	 * -> alloc_lock  used when adding/removing/searching ccb_alloc,
+	 *                which represents all ccbs open on the device
+	 * --> fifo_lock  controls access to fifo queues shared with hw
+	 *
+	 * Locks must be taken in this order, but open_lock and alloc_lock
+	 * are optional, they do not need to be held in order to take a
+	 * lower level lock.
+	 */
+	spinlock_t open_lock;
 	spinlock_t alloc_lock;
 	spinlock_t fifo_lock;
-	spinlock_t open_lock;
 
 	struct cdev cdev;
 };

drivers/serial/ucc_uart.c

@@ -1179,16 +1179,18 @@ static void uart_firmware_cont(const struct firmware *fw, void *context)
 
 	if (firmware->header.length != fw->size) {
 		dev_err(dev, "invalid firmware\n");
-		return;
+		goto out;
 	}
 
 	ret = qe_upload_firmware(firmware);
 	if (ret) {
 		dev_err(dev, "could not load firmware\n");
-		return;
+		goto out;
 	}
 
 	firmware_loaded = 1;
+ out:
+	release_firmware(fw);
 }
 
 static int ucc_uart_probe(struct of_device *ofdev,
@@ -1247,7 +1249,7 @@ static int ucc_uart_probe(struct of_device *ofdev,
 			 */
 			ret = request_firmware_nowait(THIS_MODULE,
 				FW_ACTION_HOTPLUG, filename, &ofdev->dev,
-				&ofdev->dev, uart_firmware_cont);
+				GFP_KERNEL, &ofdev->dev, uart_firmware_cont);
 			if (ret) {
 				dev_err(&ofdev->dev,
 					"could not load firmware %s\n",

drivers/staging/comedi/drivers/usbdux.c

@@ -2327,9 +2327,11 @@ static void usbdux_firmware_request_complete_handler(const struct firmware *fw,
 	if (ret) {
 		dev_err(&usbdev->dev,
 			"Could not upload firmware (err=%d)\n", ret);
-		return;
+		goto out;
 	}
 	comedi_usb_auto_config(usbdev, BOARDNAME);
+ out:
+	release_firmware(fw);
 }
 
 /* allocate memory for the urbs and initialise them */
@@ -2580,6 +2582,7 @@ static int usbduxsub_probe(struct usb_interface *uinterf,
 				      FW_ACTION_HOTPLUG,
 				      "usbdux_firmware.bin",
 				      &udev->dev,
+				      GFP_KERNEL,
 				      usbduxsub + index,
 				      usbdux_firmware_request_complete_handler);
 

drivers/staging/comedi/drivers/usbduxfast.c

@@ -1451,10 +1451,12 @@ static void usbduxfast_firmware_request_complete_handler(const struct firmware
 	if (ret) {
 		dev_err(&usbdev->dev,
 			"Could not upload firmware (err=%d)\n", ret);
-		return;
+		goto out;
 	}
 
 	comedi_usb_auto_config(usbdev, BOARDNAME);
+ out:
+	release_firmware(fw);
 }
 
 /*
@@ -1569,6 +1571,7 @@ static int usbduxfastsub_probe(struct usb_interface *uinterf,
 				      FW_ACTION_HOTPLUG,
 				      "usbduxfast_firmware.bin",
 				      &udev->dev,
+				      GFP_KERNEL,
 				      usbduxfastsub + index,
 				      usbduxfast_firmware_request_complete_handler);
 

drivers/usb/atm/ueagle-atm.c

@@ -667,12 +667,12 @@ static void uea_upload_pre_firmware(const struct firmware *fw_entry, void *conte
 	else
 		uea_info(usb, "firmware uploaded\n");
 
-	uea_leaves(usb);
-	return;
+	goto err;
 
 err_fw_corrupted:
 	uea_err(usb, "firmware is corrupted\n");
 err:
+	release_firmware(fw_entry);
 	uea_leaves(usb);
 }
 
@@ -705,7 +705,8 @@ static int uea_load_firmware(struct usb_device *usb, unsigned int ver)
 		break;
 	}
 
-	ret = request_firmware_nowait(THIS_MODULE, 1, fw_name, &usb->dev, usb, uea_upload_pre_firmware);
+	ret = request_firmware_nowait(THIS_MODULE, 1, fw_name, &usb->dev,
+				      GFP_KERNEL, usb, uea_upload_pre_firmware);
 	if (ret)
 		uea_err(usb, "firmware %s is not available\n", fw_name);
 	else

fs/debugfs/inode.c

@@ -32,7 +32,9 @@ static struct vfsmount *debugfs_mount;
 static int debugfs_mount_count;
 static bool debugfs_registered;
 
-static struct inode *debugfs_get_inode(struct super_block *sb, int mode, dev_t dev)
+static struct inode *debugfs_get_inode(struct super_block *sb, int mode, dev_t dev,
+				       void *data, const struct file_operations *fops)
+
 {
 	struct inode *inode = new_inode(sb);
 
@@ -44,14 +46,18 @@ static struct inode *debugfs_get_inode(struct super_block *sb, int mode, dev_t d
 			init_special_inode(inode, mode, dev);
 			break;
 		case S_IFREG:
-			inode->i_fop = &debugfs_file_operations;
+			inode->i_fop = fops ? fops : &debugfs_file_operations;
+			inode->i_private = data;
 			break;
 		case S_IFLNK:
 			inode->i_op = &debugfs_link_operations;
+			inode->i_fop = fops;
+			inode->i_private = data;
 			break;
 		case S_IFDIR:
 			inode->i_op = &simple_dir_inode_operations;
-			inode->i_fop = &simple_dir_operations;
+			inode->i_fop = fops ? fops : &simple_dir_operations;
+			inode->i_private = data;
 
 			/* directory inodes start off with i_nlink == 2
 			 * (for "." entry) */
@@ -64,7 +70,8 @@ static struct inode *debugfs_get_inode(struct super_block *sb, int mode, dev_t d
 
 /* SMP-safe */
 static int debugfs_mknod(struct inode *dir, struct dentry *dentry,
-			 int mode, dev_t dev)
+			 int mode, dev_t dev, void *data,
+			 const struct file_operations *fops)
 {
 	struct inode *inode;
 	int error = -EPERM;
@@ -72,7 +79,7 @@ static int debugfs_mknod(struct inode *dir, struct dentry *dentry,
 	if (dentry->d_inode)
 		return -EEXIST;
 
-	inode = debugfs_get_inode(dir->i_sb, mode, dev);
+	inode = debugfs_get_inode(dir->i_sb, mode, dev, data, fops);
 	if (inode) {
 		d_instantiate(dentry, inode);
 		dget(dentry);
@@ -81,12 +88,13 @@ static int debugfs_mknod(struct inode *dir, struct dentry *dentry,
 	return error;
 }
 
-static int debugfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
+static int debugfs_mkdir(struct inode *dir, struct dentry *dentry, int mode,
+			 void *data, const struct file_operations *fops)
 {
 	int res;
 
 	mode = (mode & (S_IRWXUGO | S_ISVTX)) | S_IFDIR;
-	res = debugfs_mknod(dir, dentry, mode, 0);
+	res = debugfs_mknod(dir, dentry, mode, 0, data, fops);
 	if (!res) {
 		inc_nlink(dir);
 		fsnotify_mkdir(dir, dentry);
@@ -94,18 +102,20 @@ static int debugfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 	return res;
 }
 
-static int debugfs_link(struct inode *dir, struct dentry *dentry, int mode)
+static int debugfs_link(struct inode *dir, struct dentry *dentry, int mode,
+			void *data, const struct file_operations *fops)
 {
 	mode = (mode & S_IALLUGO) | S_IFLNK;
-	return debugfs_mknod(dir, dentry, mode, 0);
+	return debugfs_mknod(dir, dentry, mode, 0, data, fops);
 }
 
-static int debugfs_create(struct inode *dir, struct dentry *dentry, int mode)
+static int debugfs_create(struct inode *dir, struct dentry *dentry, int mode,
+			  void *data, const struct file_operations *fops)
 {
 	int res;
 
 	mode = (mode & S_IALLUGO) | S_IFREG;
-	res = debugfs_mknod(dir, dentry, mode, 0);
+	res = debugfs_mknod(dir, dentry, mode, 0, data, fops);
 	if (!res)
 		fsnotify_create(dir, dentry);
 	return res;
@@ -139,7 +149,9 @@ static struct file_system_type debug_fs_type = {
 
 static int debugfs_create_by_name(const char *name, mode_t mode,
 				  struct dentry *parent,
-				  struct dentry **dentry)
+				  struct dentry **dentry,
+				  void *data,
+				  const struct file_operations *fops)
 {
 	int error = 0;
 
@@ -164,13 +176,16 @@ static int debugfs_create_by_name(const char *name, mode_t mode,
 	if (!IS_ERR(*dentry)) {
 		switch (mode & S_IFMT) {
 		case S_IFDIR:
-			error = debugfs_mkdir(parent->d_inode, *dentry, mode);
+			error = debugfs_mkdir(parent->d_inode, *dentry, mode,
+					      data, fops);
 			break;
 		case S_IFLNK:
-			error = debugfs_link(parent->d_inode, *dentry, mode);
+			error = debugfs_link(parent->d_inode, *dentry, mode,
+					     data, fops);
 			break;
 		default:
-			error = debugfs_create(parent->d_inode, *dentry, mode);
+			error = debugfs_create(parent->d_inode, *dentry, mode,
+					       data, fops);
 			break;
 		}
 		dput(*dentry);
@@ -221,19 +236,13 @@ struct dentry *debugfs_create_file(const char *name, mode_t mode,
 	if (error)
 		goto exit;
 
-	error = debugfs_create_by_name(name, mode, parent, &dentry);
+	error = debugfs_create_by_name(name, mode, parent, &dentry,
+				       data, fops);
 	if (error) {
 		dentry = NULL;
 		simple_release_fs(&debugfs_mount, &debugfs_mount_count);
 		goto exit;
 	}
-
-	if (dentry->d_inode) {
-		if (data)
-			dentry->d_inode->i_private = data;
-		if (fops)
-			dentry->d_inode->i_fop = fops;
-	}
 exit:
 	return dentry;
 }

fs/namei.c

@@ -1279,28 +1279,6 @@ struct dentry *lookup_one_len(const char *name, struct dentry *base, int len)
 	return __lookup_hash(&this, base, NULL);
 }
 
-/**
- * lookup_one_noperm - bad hack for sysfs
- * @name:	pathname component to lookup
- * @base:	base directory to lookup from
- *
- * This is a variant of lookup_one_len that doesn't perform any permission
- * checks.   It's a horrible hack to work around the braindead sysfs
- * architecture and should not be used anywhere else.
- *
- * DON'T USE THIS FUNCTION EVER, thanks.
- */
-struct dentry *lookup_one_noperm(const char *name, struct dentry *base)
-{
-	int err;
-	struct qstr this;
-
-	err = __lookup_one_len(name, &this, base, strlen(name));
-	if (err)
-		return ERR_PTR(err);
-	return __lookup_hash(&this, base, NULL);
-}
-
 int user_path_at(int dfd, const char __user *name, unsigned flags,
 		 struct path *path)
 {

fs/sysfs/dir.c

@@ -25,7 +25,6 @@
 #include "sysfs.h"
 
 DEFINE_MUTEX(sysfs_mutex);
-DEFINE_MUTEX(sysfs_rename_mutex);
 DEFINE_SPINLOCK(sysfs_assoc_lock);
 
 static DEFINE_SPINLOCK(sysfs_ino_lock);
@@ -84,46 +83,6 @@ static void sysfs_unlink_sibling(struct sysfs_dirent *sd)
 	}
 }
 
-/**
- *	sysfs_get_dentry - get dentry for the given sysfs_dirent
- *	@sd: sysfs_dirent of interest
- *
- *	Get dentry for @sd.  Dentry is looked up if currently not
- *	present.  This function descends from the root looking up
- *	dentry for each step.
- *
- *	LOCKING:
- *	mutex_lock(sysfs_rename_mutex)
- *
- *	RETURNS:
- *	Pointer to found dentry on success, ERR_PTR() value on error.
- */
-struct dentry *sysfs_get_dentry(struct sysfs_dirent *sd)
-{
-	struct dentry *dentry = dget(sysfs_sb->s_root);
-
-	while (dentry->d_fsdata != sd) {
-		struct sysfs_dirent *cur;
-		struct dentry *parent;
-
-		/* find the first ancestor which hasn't been looked up */
-		cur = sd;
-		while (cur->s_parent != dentry->d_fsdata)
-			cur = cur->s_parent;
-
-		/* look it up */
-		parent = dentry;
-		mutex_lock(&parent->d_inode->i_mutex);
-		dentry = lookup_one_noperm(cur->s_name, parent);
-		mutex_unlock(&parent->d_inode->i_mutex);
-		dput(parent);
-
-		if (IS_ERR(dentry))
-			break;
-	}
-	return dentry;
-}
-
 /**
  *	sysfs_get_active - get an active reference to sysfs_dirent
  *	@sd: sysfs_dirent to get an active reference to
@@ -298,7 +257,61 @@ void release_sysfs_dirent(struct sysfs_dirent * sd)
 		goto repeat;
 }
 
-static void sysfs_d_iput(struct dentry * dentry, struct inode * inode)
+static int sysfs_dentry_delete(struct dentry *dentry)
+{
+	struct sysfs_dirent *sd = dentry->d_fsdata;
+	return !!(sd->s_flags & SYSFS_FLAG_REMOVED);
+}
+
+static int sysfs_dentry_revalidate(struct dentry *dentry, struct nameidata *nd)
+{
+	struct sysfs_dirent *sd = dentry->d_fsdata;
+	int is_dir;
+
+	mutex_lock(&sysfs_mutex);
+
+	/* The sysfs dirent has been deleted */
+	if (sd->s_flags & SYSFS_FLAG_REMOVED)
+		goto out_bad;
+
+	/* The sysfs dirent has been moved? */
+	if (dentry->d_parent->d_fsdata != sd->s_parent)
+		goto out_bad;
+
+	/* The sysfs dirent has been renamed */
+	if (strcmp(dentry->d_name.name, sd->s_name) != 0)
+		goto out_bad;
+
+	mutex_unlock(&sysfs_mutex);
+out_valid:
+	return 1;
+out_bad:
+	/* Remove the dentry from the dcache hashes.
+	 * If this is a deleted dentry we use d_drop instead of d_delete
+	 * so sysfs doesn't need to cope with negative dentries.
+	 *
+	 * If this is a dentry that has simply been renamed we
+	 * use d_drop to remove it from the dcache lookup on its
+	 * old parent.  If this dentry persists later when a lookup
+	 * is performed at its new name the dentry will be readded
+	 * to the dcache hashes.
+	 */
+	is_dir = (sysfs_type(sd) == SYSFS_DIR);
+	mutex_unlock(&sysfs_mutex);
+	if (is_dir) {
+		/* If we have submounts we must allow the vfs caches
+		 * to lie about the state of the filesystem to prevent
+		 * leaks and other nasty things.
+		 */
+		if (have_submounts(dentry))
+			goto out_valid;
+		shrink_dcache_parent(dentry);
+	}
+	d_drop(dentry);
+	return 0;
+}
+
+static void sysfs_dentry_iput(struct dentry *dentry, struct inode *inode)
 {
 	struct sysfs_dirent * sd = dentry->d_fsdata;
 
@@ -307,7 +320,9 @@ static void sysfs_d_iput(struct dentry * dentry, struct inode * inode)
 }
 
 static const struct dentry_operations sysfs_dentry_ops = {
-	.d_iput		= sysfs_d_iput,
+	.d_revalidate	= sysfs_dentry_revalidate,
+	.d_delete	= sysfs_dentry_delete,
+	.d_iput		= sysfs_dentry_iput,
 };
 
 struct sysfs_dirent *sysfs_new_dirent(const char *name, umode_t mode, int type)
@@ -344,12 +359,6 @@ struct sysfs_dirent *sysfs_new_dirent(const char *name, umode_t mode, int type)
 	return NULL;
 }
 
-static int sysfs_ilookup_test(struct inode *inode, void *arg)
-{
-	struct sysfs_dirent *sd = arg;
-	return inode->i_ino == sd->s_ino;
-}
-
 /**
  *	sysfs_addrm_start - prepare for sysfs_dirent add/remove
  *	@acxt: pointer to sysfs_addrm_cxt to be used
@@ -357,47 +366,20 @@ static int sysfs_ilookup_test(struct inode *inode, void *arg)
  *
  *	This function is called when the caller is about to add or
  *	remove sysfs_dirent under @parent_sd.  This function acquires
- *	sysfs_mutex, grabs inode for @parent_sd if available and lock
- *	i_mutex of it.  @acxt is used to keep and pass context to
+ *	sysfs_mutex.  @acxt is used to keep and pass context to
  *	other addrm functions.
  *
  *	LOCKING:
  *	Kernel thread context (may sleep).  sysfs_mutex is locked on
- *	return.  i_mutex of parent inode is locked on return if
- *	available.
+ *	return.
  */
 void sysfs_addrm_start(struct sysfs_addrm_cxt *acxt,
 		       struct sysfs_dirent *parent_sd)
 {
-	struct inode *inode;
-
 	memset(acxt, 0, sizeof(*acxt));
 	acxt->parent_sd = parent_sd;
 
-	/* Lookup parent inode.  inode initialization is protected by
-	 * sysfs_mutex, so inode existence can be determined by
-	 * looking up inode while holding sysfs_mutex.
-	 */
 	mutex_lock(&sysfs_mutex);
-
-	inode = ilookup5(sysfs_sb, parent_sd->s_ino, sysfs_ilookup_test,
-			 parent_sd);
-	if (inode) {
-		WARN_ON(inode->i_state & I_NEW);
-
-		/* parent inode available */
-		acxt->parent_inode = inode;
-
-		/* sysfs_mutex is below i_mutex in lock hierarchy.
-		 * First, trylock i_mutex.  If fails, unlock
-		 * sysfs_mutex and lock them in order.
-		 */
-		if (!mutex_trylock(&inode->i_mutex)) {
-			mutex_unlock(&sysfs_mutex);
-			mutex_lock(&inode->i_mutex);
-			mutex_lock(&sysfs_mutex);
-		}
-	}
 }
 
 /**
@@ -422,18 +404,22 @@ void sysfs_addrm_start(struct sysfs_addrm_cxt *acxt,
  */
 int __sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd)
 {
+	struct sysfs_inode_attrs *ps_iattr;
+
 	if (sysfs_find_dirent(acxt->parent_sd, sd->s_name))
 		return -EEXIST;
 
 	sd->s_parent = sysfs_get(acxt->parent_sd);
 
-	if (sysfs_type(sd) == SYSFS_DIR && acxt->parent_inode)
-		inc_nlink(acxt->parent_inode);
-
-	acxt->cnt++;
-
 	sysfs_link_sibling(sd);
 
+	/* Update timestamps on the parent */
+	ps_iattr = acxt->parent_sd->s_iattr;
+	if (ps_iattr) {
+		struct iattr *ps_iattrs = &ps_iattr->ia_iattr;
+		ps_iattrs->ia_ctime = ps_iattrs->ia_mtime = CURRENT_TIME;
+	}
+
 	return 0;
 }
 
@@ -512,70 +498,22 @@ int sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd)
  */
 void sysfs_remove_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd)
 {
+	struct sysfs_inode_attrs *ps_iattr;
+
 	BUG_ON(sd->s_flags & SYSFS_FLAG_REMOVED);
 
 	sysfs_unlink_sibling(sd);
 
+	/* Update timestamps on the parent */
+	ps_iattr = acxt->parent_sd->s_iattr;
+	if (ps_iattr) {
+		struct iattr *ps_iattrs = &ps_iattr->ia_iattr;
+		ps_iattrs->ia_ctime = ps_iattrs->ia_mtime = CURRENT_TIME;
+	}
+
 	sd->s_flags |= SYSFS_FLAG_REMOVED;
 	sd->s_sibling = acxt->removed;
 	acxt->removed = sd;
-
-	if (sysfs_type(sd) == SYSFS_DIR && acxt->parent_inode)
-		drop_nlink(acxt->parent_inode);
-
-	acxt->cnt++;
-}
-
-/**
- *	sysfs_drop_dentry - drop dentry for the specified sysfs_dirent
- *	@sd: target sysfs_dirent
- *
- *	Drop dentry for @sd.  @sd must have been unlinked from its
- *	parent on entry to this function such that it can't be looked
- *	up anymore.
- */
-static void sysfs_drop_dentry(struct sysfs_dirent *sd)
-{
-	struct inode *inode;
-	struct dentry *dentry;
-
-	inode = ilookup(sysfs_sb, sd->s_ino);
-	if (!inode)
-		return;
-
-	/* Drop any existing dentries associated with sd.
-	 *
-	 * For the dentry to be properly freed we need to grab a
-	 * reference to the dentry under the dcache lock,  unhash it,
-	 * and then put it.  The playing with the dentry count allows
-	 * dput to immediately free the dentry  if it is not in use.
-	 */
-repeat:
-	spin_lock(&dcache_lock);
-	list_for_each_entry(dentry, &inode->i_dentry, d_alias) {
-		if (d_unhashed(dentry))
-			continue;
-		dget_locked(dentry);
-		spin_lock(&dentry->d_lock);
-		__d_drop(dentry);
-		spin_unlock(&dentry->d_lock);
-		spin_unlock(&dcache_lock);
-		dput(dentry);
-		goto repeat;
-	}
-	spin_unlock(&dcache_lock);
-
-	/* adjust nlink and update timestamp */
-	mutex_lock(&inode->i_mutex);
-
-	inode->i_ctime = CURRENT_TIME;
-	drop_nlink(inode);
-	if (sysfs_type(sd) == SYSFS_DIR)
-		drop_nlink(inode);
-
-	mutex_unlock(&inode->i_mutex);
-
-	iput(inode);
 }
 
 /**
@@ -584,25 +522,15 @@ static void sysfs_drop_dentry(struct sysfs_dirent *sd)
  *
  *	Finish up sysfs_dirent add/remove.  Resources acquired by
  *	sysfs_addrm_start() are released and removed sysfs_dirents are
- *	cleaned up.  Timestamps on the parent inode are updated.
+ *	cleaned up.
  *
  *	LOCKING:
- *	All mutexes acquired by sysfs_addrm_start() are released.
+ *	sysfs_mutex is released.
  */
 void sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt)
 {
 	/* release resources acquired by sysfs_addrm_start() */
 	mutex_unlock(&sysfs_mutex);
-	if (acxt->parent_inode) {
-		struct inode *inode = acxt->parent_inode;
-
-		/* if added/removed, update timestamps on the parent */
-		if (acxt->cnt)
-			inode->i_ctime = inode->i_mtime = CURRENT_TIME;
-
-		mutex_unlock(&inode->i_mutex);
-		iput(inode);
-	}
 
 	/* kill removed sysfs_dirents */
 	while (acxt->removed) {
@@ -611,7 +539,6 @@ void sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt)
 		acxt->removed = sd->s_sibling;
 		sd->s_sibling = NULL;
 
-		sysfs_drop_dentry(sd);
 		sysfs_deactivate(sd);
 		unmap_bin_file(sd);
 		sysfs_put(sd);
@@ -751,10 +678,15 @@ static struct dentry * sysfs_lookup(struct inode *dir, struct dentry *dentry,
 	}
 
 	/* instantiate and hash dentry */
-	dentry->d_op = &sysfs_dentry_ops;
-	dentry->d_fsdata = sysfs_get(sd);
-	d_instantiate(dentry, inode);
-	d_rehash(dentry);
+	ret = d_find_alias(inode);
+	if (!ret) {
+		dentry->d_op = &sysfs_dentry_ops;
+		dentry->d_fsdata = sysfs_get(sd);
+		d_add(dentry, inode);
+	} else {
+		d_move(ret, dentry);
+		iput(inode);
+	}
 
  out_unlock:
 	mutex_unlock(&sysfs_mutex);
@@ -763,7 +695,9 @@ static struct dentry * sysfs_lookup(struct inode *dir, struct dentry *dentry,
 
 const struct inode_operations sysfs_dir_inode_operations = {
 	.lookup		= sysfs_lookup,
+	.permission	= sysfs_permission,
 	.setattr	= sysfs_setattr,
+	.getattr	= sysfs_getattr,
 	.setxattr	= sysfs_setxattr,
 };
 
@@ -826,141 +760,65 @@ void sysfs_remove_dir(struct kobject * kobj)
 	__sysfs_remove_dir(sd);
 }
 
-int sysfs_rename_dir(struct kobject * kobj, const char *new_name)
+int sysfs_rename(struct sysfs_dirent *sd,
+	struct sysfs_dirent *new_parent_sd, const char *new_name)
 {
-	struct sysfs_dirent *sd = kobj->sd;
-	struct dentry *parent = NULL;
-	struct dentry *old_dentry = NULL, *new_dentry = NULL;
 	const char *dup_name = NULL;
 	int error;
 
-	mutex_lock(&sysfs_rename_mutex);
+	mutex_lock(&sysfs_mutex);
 
 	error = 0;
-	if (strcmp(sd->s_name, new_name) == 0)
+	if ((sd->s_parent == new_parent_sd) &&
+	    (strcmp(sd->s_name, new_name) == 0))
 		goto out;	/* nothing to rename */
 
-	/* get the original dentry */
-	old_dentry = sysfs_get_dentry(sd);
-	if (IS_ERR(old_dentry)) {
-		error = PTR_ERR(old_dentry);
-		old_dentry = NULL;
-		goto out;
-	}
-
-	parent = old_dentry->d_parent;
-
-	/* lock parent and get dentry for new name */
-	mutex_lock(&parent->d_inode->i_mutex);
-	mutex_lock(&sysfs_mutex);
-
 	error = -EEXIST;
-	if (sysfs_find_dirent(sd->s_parent, new_name))
-		goto out_unlock;
-
-	error = -ENOMEM;
-	new_dentry = d_alloc_name(parent, new_name);
-	if (!new_dentry)
-		goto out_unlock;
+	if (sysfs_find_dirent(new_parent_sd, new_name))
+		goto out;
 
 	/* rename sysfs_dirent */
-	error = -ENOMEM;
-	new_name = dup_name = kstrdup(new_name, GFP_KERNEL);
-	if (!new_name)
-		goto out_unlock;
-
-	dup_name = sd->s_name;
-	sd->s_name = new_name;
+	if (strcmp(sd->s_name, new_name) != 0) {
+		error = -ENOMEM;
+		new_name = dup_name = kstrdup(new_name, GFP_KERNEL);
+		if (!new_name)
+			goto out;
+
+		dup_name = sd->s_name;
+		sd->s_name = new_name;
+	}
 
-	/* rename */
-	d_add(new_dentry, NULL);
-	d_move(old_dentry, new_dentry);
+	/* Remove from old parent's list and insert into new parent's list. */
+	if (sd->s_parent != new_parent_sd) {
+		sysfs_unlink_sibling(sd);
+		sysfs_get(new_parent_sd);
+		sysfs_put(sd->s_parent);
+		sd->s_parent = new_parent_sd;
+		sysfs_link_sibling(sd);
+	}
 
 	error = 0;
- out_unlock:
+ out:
 	mutex_unlock(&sysfs_mutex);
-	mutex_unlock(&parent->d_inode->i_mutex);
 	kfree(dup_name);
-	dput(old_dentry);
-	dput(new_dentry);
- out:
-	mutex_unlock(&sysfs_rename_mutex);
 	return error;
 }
 
+int sysfs_rename_dir(struct kobject *kobj, const char *new_name)
+{
+	return sysfs_rename(kobj->sd, kobj->sd->s_parent, new_name);
+}
+
 int sysfs_move_dir(struct kobject *kobj, struct kobject *new_parent_kobj)
 {
 	struct sysfs_dirent *sd = kobj->sd;
 	struct sysfs_dirent *new_parent_sd;
-	struct dentry *old_parent, *new_parent = NULL;
-	struct dentry *old_dentry = NULL, *new_dentry = NULL;
-	int error;
 
-	mutex_lock(&sysfs_rename_mutex);
 	BUG_ON(!sd->s_parent);
-	new_parent_sd = (new_parent_kobj && new_parent_kobj->sd) ?
+	new_parent_sd = new_parent_kobj && new_parent_kobj->sd ?
 		new_parent_kobj->sd : &sysfs_root;
 
-	error = 0;
-	if (sd->s_parent == new_parent_sd)
-		goto out;	/* nothing to move */
-
-	/* get dentries */
-	old_dentry = sysfs_get_dentry(sd);
-	if (IS_ERR(old_dentry)) {
-		error = PTR_ERR(old_dentry);
-		old_dentry = NULL;
-		goto out;
-	}
-	old_parent = old_dentry->d_parent;
-
-	new_parent = sysfs_get_dentry(new_parent_sd);
-	if (IS_ERR(new_parent)) {
-		error = PTR_ERR(new_parent);
-		new_parent = NULL;
-		goto out;
-	}
-
-again:
-	mutex_lock(&old_parent->d_inode->i_mutex);
-	if (!mutex_trylock(&new_parent->d_inode->i_mutex)) {
-		mutex_unlock(&old_parent->d_inode->i_mutex);
-		goto again;
-	}
-	mutex_lock(&sysfs_mutex);
-
-	error = -EEXIST;
-	if (sysfs_find_dirent(new_parent_sd, sd->s_name))
-		goto out_unlock;
-
-	error = -ENOMEM;
-	new_dentry = d_alloc_name(new_parent, sd->s_name);
-	if (!new_dentry)
-		goto out_unlock;
-
-	error = 0;
-	d_add(new_dentry, NULL);
-	d_move(old_dentry, new_dentry);
-
-	/* Remove from old parent's list and insert into new parent's list. */
-	sysfs_unlink_sibling(sd);
-	sysfs_get(new_parent_sd);
-	drop_nlink(old_parent->d_inode);
-	sysfs_put(sd->s_parent);
-	sd->s_parent = new_parent_sd;
-	inc_nlink(new_parent->d_inode);
-	sysfs_link_sibling(sd);
-
- out_unlock:
-	mutex_unlock(&sysfs_mutex);
-	mutex_unlock(&new_parent->d_inode->i_mutex);
-	mutex_unlock(&old_parent->d_inode->i_mutex);
- out:
-	dput(new_parent);
-	dput(old_dentry);
-	dput(new_dentry);
-	mutex_unlock(&sysfs_rename_mutex);
-	return error;
+	return sysfs_rename(sd, new_parent_sd, sd->s_name);
 }
 
 /* Relationship between s_mode and the DT_xxx types */

fs/sysfs/file.c

@@ -579,46 +579,23 @@ EXPORT_SYMBOL_GPL(sysfs_add_file_to_group);
  */
 int sysfs_chmod_file(struct kobject *kobj, struct attribute *attr, mode_t mode)
 {
-	struct sysfs_dirent *victim_sd = NULL;
-	struct dentry *victim = NULL;
-	struct inode * inode;
+	struct sysfs_dirent *sd;
 	struct iattr newattrs;
 	int rc;
 
-	rc = -ENOENT;
-	victim_sd = sysfs_get_dirent(kobj->sd, attr->name);
-	if (!victim_sd)
-		goto out;
+	mutex_lock(&sysfs_mutex);
 
-	mutex_lock(&sysfs_rename_mutex);
-	victim = sysfs_get_dentry(victim_sd);
-	mutex_unlock(&sysfs_rename_mutex);
-	if (IS_ERR(victim)) {
-		rc = PTR_ERR(victim);
-		victim = NULL;
+	rc = -ENOENT;
+	sd = sysfs_find_dirent(kobj->sd, attr->name);
+	if (!sd)
 		goto out;
-	}
-
-	inode = victim->d_inode;
-
-	mutex_lock(&inode->i_mutex);
 
-	newattrs.ia_mode = (mode & S_IALLUGO) | (inode->i_mode & ~S_IALLUGO);
-	newattrs.ia_valid = ATTR_MODE | ATTR_CTIME;
-	newattrs.ia_ctime = current_fs_time(inode->i_sb);
-	rc = sysfs_setattr(victim, &newattrs);
+	newattrs.ia_mode = (mode & S_IALLUGO) | (sd->s_mode & ~S_IALLUGO);
+	newattrs.ia_valid = ATTR_MODE;
+	rc = sysfs_sd_setattr(sd, &newattrs);
 
-	if (rc == 0) {
-		fsnotify_change(victim, newattrs.ia_valid);
-		mutex_lock(&sysfs_mutex);
-		victim_sd->s_mode = newattrs.ia_mode;
-		mutex_unlock(&sysfs_mutex);
-	}
-
-	mutex_unlock(&inode->i_mutex);
  out:
-	dput(victim);
-	sysfs_put(victim_sd);
+	mutex_unlock(&sysfs_mutex);
 	return rc;
 }
 EXPORT_SYMBOL_GPL(sysfs_chmod_file);

fs/sysfs/inode.c

@@ -37,7 +37,9 @@ static struct backing_dev_info sysfs_backing_dev_info = {
 };
 
 static const struct inode_operations sysfs_inode_operations ={
+	.permission	= sysfs_permission,
 	.setattr	= sysfs_setattr,
+	.getattr	= sysfs_getattr,
 	.setxattr	= sysfs_setxattr,
 };
 
@@ -46,7 +48,7 @@ int __init sysfs_inode_init(void)
 	return bdi_init(&sysfs_backing_dev_info);
 }
 
-struct sysfs_inode_attrs *sysfs_init_inode_attrs(struct sysfs_dirent *sd)
+static struct sysfs_inode_attrs *sysfs_init_inode_attrs(struct sysfs_dirent *sd)
 {
 	struct sysfs_inode_attrs *attrs;
 	struct iattr *iattrs;
@@ -64,30 +66,15 @@ struct sysfs_inode_attrs *sysfs_init_inode_attrs(struct sysfs_dirent *sd)
 
 	return attrs;
 }
-int sysfs_setattr(struct dentry * dentry, struct iattr * iattr)
+
+int sysfs_sd_setattr(struct sysfs_dirent *sd, struct iattr * iattr)
 {
-	struct inode * inode = dentry->d_inode;
-	struct sysfs_dirent * sd = dentry->d_fsdata;
 	struct sysfs_inode_attrs *sd_attrs;
 	struct iattr *iattrs;
 	unsigned int ia_valid = iattr->ia_valid;
-	int error;
-
-	if (!sd)
-		return -EINVAL;
 
 	sd_attrs = sd->s_iattr;
 
-	error = inode_change_ok(inode, iattr);
-	if (error)
-		return error;
-
-	iattr->ia_valid &= ~ATTR_SIZE; /* ignore size changes */
-
-	error = inode_setattr(inode, iattr);
-	if (error)
-		return error;
-
 	if (!sd_attrs) {
 		/* setting attributes for the first time, allocate now */
 		sd_attrs = sysfs_init_inode_attrs(sd);
@@ -103,42 +90,78 @@ int sysfs_setattr(struct dentry * dentry, struct iattr * iattr)
 		if (ia_valid & ATTR_GID)
 			iattrs->ia_gid = iattr->ia_gid;
 		if (ia_valid & ATTR_ATIME)
-			iattrs->ia_atime = timespec_trunc(iattr->ia_atime,
-					inode->i_sb->s_time_gran);
+			iattrs->ia_atime = iattr->ia_atime;
 		if (ia_valid & ATTR_MTIME)
-			iattrs->ia_mtime = timespec_trunc(iattr->ia_mtime,
-					inode->i_sb->s_time_gran);
+			iattrs->ia_mtime = iattr->ia_mtime;
 		if (ia_valid & ATTR_CTIME)
-			iattrs->ia_ctime = timespec_trunc(iattr->ia_ctime,
-					inode->i_sb->s_time_gran);
+			iattrs->ia_ctime = iattr->ia_ctime;
 		if (ia_valid & ATTR_MODE) {
 			umode_t mode = iattr->ia_mode;
-
-			if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
-				mode &= ~S_ISGID;
 			iattrs->ia_mode = sd->s_mode = mode;
 		}
 	}
+	return 0;
+}
+
+int sysfs_setattr(struct dentry *dentry, struct iattr *iattr)
+{
+	struct inode *inode = dentry->d_inode;
+	struct sysfs_dirent *sd = dentry->d_fsdata;
+	int error;
+
+	if (!sd)
+		return -EINVAL;
+
+	error = inode_change_ok(inode, iattr);
+	if (error)
+		return error;
+
+	iattr->ia_valid &= ~ATTR_SIZE; /* ignore size changes */
+
+	error = inode_setattr(inode, iattr);
+	if (error)
+		return error;
+
+	mutex_lock(&sysfs_mutex);
+	error = sysfs_sd_setattr(sd, iattr);
+	mutex_unlock(&sysfs_mutex);
+
 	return error;
 }
 
+static int sysfs_sd_setsecdata(struct sysfs_dirent *sd, void **secdata, u32 *secdata_len)
+{
+	struct sysfs_inode_attrs *iattrs;
+	void *old_secdata;
+	size_t old_secdata_len;
+
+	iattrs = sd->s_iattr;
+	if (!iattrs)
+		iattrs = sysfs_init_inode_attrs(sd);
+	if (!iattrs)
+		return -ENOMEM;
+
+	old_secdata = iattrs->ia_secdata;
+	old_secdata_len = iattrs->ia_secdata_len;
+
+	iattrs->ia_secdata = *secdata;
+	iattrs->ia_secdata_len = *secdata_len;
+
+	*secdata = old_secdata;
+	*secdata_len = old_secdata_len;
+	return 0;
+}
+
 int sysfs_setxattr(struct dentry *dentry, const char *name, const void *value,
 		size_t size, int flags)
 {
 	struct sysfs_dirent *sd = dentry->d_fsdata;
-	struct sysfs_inode_attrs *iattrs;
 	void *secdata;
 	int error;
 	u32 secdata_len = 0;
 
 	if (!sd)
 		return -EINVAL;
-	if (!sd->s_iattr)
-		sd->s_iattr = sysfs_init_inode_attrs(sd);
-	if (!sd->s_iattr)
-		return -ENOMEM;
-
-	iattrs = sd->s_iattr;
 
 	if (!strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN)) {
 		const char *suffix = name + XATTR_SECURITY_PREFIX_LEN;
@@ -150,12 +173,13 @@ int sysfs_setxattr(struct dentry *dentry, const char *name, const void *value,
 						&secdata, &secdata_len);
 		if (error)
 			goto out;
-		if (iattrs->ia_secdata)
-			security_release_secctx(iattrs->ia_secdata,
-						iattrs->ia_secdata_len);
-		iattrs->ia_secdata = secdata;
-		iattrs->ia_secdata_len = secdata_len;
 
+		mutex_lock(&sysfs_mutex);
+		error = sysfs_sd_setsecdata(sd, &secdata, &secdata_len);
+		mutex_unlock(&sysfs_mutex);
+
+		if (secdata)
+			security_release_secctx(secdata, secdata_len);
 	} else
 		return -EINVAL;
 out:
@@ -170,7 +194,6 @@ static inline void set_default_inode_attr(struct inode * inode, mode_t mode)
 
 static inline void set_inode_attr(struct inode * inode, struct iattr * iattr)
 {
-	inode->i_mode = iattr->ia_mode;
 	inode->i_uid = iattr->ia_uid;
 	inode->i_gid = iattr->ia_gid;
 	inode->i_atime = iattr->ia_atime;
@@ -178,17 +201,6 @@ static inline void set_inode_attr(struct inode * inode, struct iattr * iattr)
 	inode->i_ctime = iattr->ia_ctime;
 }
 
-
-/*
- * sysfs has a different i_mutex lock order behavior for i_mutex than other
- * filesystems; sysfs i_mutex is called in many places with subsystem locks
- * held. At the same time, many of the VFS locking rules do not apply to
- * sysfs at all (cross directory rename for example). To untangle this mess
- * (which gives false positives in lockdep), we're giving sysfs inodes their
- * own class for i_mutex.
- */
-static struct lock_class_key sysfs_inode_imutex_key;
-
 static int sysfs_count_nlink(struct sysfs_dirent *sd)
 {
 	struct sysfs_dirent *child;
@@ -201,38 +213,55 @@ static int sysfs_count_nlink(struct sysfs_dirent *sd)
 	return nr + 2;
 }
 
+static void sysfs_refresh_inode(struct sysfs_dirent *sd, struct inode *inode)
+{
+	struct sysfs_inode_attrs *iattrs = sd->s_iattr;
+
+	inode->i_mode = sd->s_mode;
+	if (iattrs) {
+		/* sysfs_dirent has non-default attributes
+		 * get them from persistent copy in sysfs_dirent
+		 */
+		set_inode_attr(inode, &iattrs->ia_iattr);
+		security_inode_notifysecctx(inode,
+					    iattrs->ia_secdata,
+					    iattrs->ia_secdata_len);
+	}
+
+	if (sysfs_type(sd) == SYSFS_DIR)
+		inode->i_nlink = sysfs_count_nlink(sd);
+}
+
+int sysfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
+{
+	struct sysfs_dirent *sd = dentry->d_fsdata;
+	struct inode *inode = dentry->d_inode;
+
+	mutex_lock(&sysfs_mutex);
+	sysfs_refresh_inode(sd, inode);
+	mutex_unlock(&sysfs_mutex);
+
+	generic_fillattr(inode, stat);
+	return 0;
+}
+
 static void sysfs_init_inode(struct sysfs_dirent *sd, struct inode *inode)
 {
 	struct bin_attribute *bin_attr;
-	struct sysfs_inode_attrs *iattrs;
 
 	inode->i_private = sysfs_get(sd);
 	inode->i_mapping->a_ops = &sysfs_aops;
 	inode->i_mapping->backing_dev_info = &sysfs_backing_dev_info;
 	inode->i_op = &sysfs_inode_operations;
-	inode->i_ino = sd->s_ino;
-	lockdep_set_class(&inode->i_mutex, &sysfs_inode_imutex_key);
 
-	iattrs = sd->s_iattr;
-	if (iattrs) {
-		/* sysfs_dirent has non-default attributes
-		 * get them for the new inode from persistent copy
-		 * in sysfs_dirent
-		 */
-		set_inode_attr(inode, &iattrs->ia_iattr);
-		if (iattrs->ia_secdata)
-			security_inode_notifysecctx(inode,
-						iattrs->ia_secdata,
-						iattrs->ia_secdata_len);
-	} else
-		set_default_inode_attr(inode, sd->s_mode);
+	set_default_inode_attr(inode, sd->s_mode);
+	sysfs_refresh_inode(sd, inode);
 
 	/* initialize inode according to type */
 	switch (sysfs_type(sd)) {
 	case SYSFS_DIR:
 		inode->i_op = &sysfs_dir_inode_operations;
 		inode->i_fop = &sysfs_dir_operations;
-		inode->i_nlink = sysfs_count_nlink(sd);
 		break;
 	case SYSFS_KOBJ_ATTR:
 		inode->i_size = PAGE_SIZE;
@@ -315,3 +344,14 @@ int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const char *name)
 	else
 		return -ENOENT;
 }
+
+int sysfs_permission(struct inode *inode, int mask)
+{
+	struct sysfs_dirent *sd = inode->i_private;
+
+	mutex_lock(&sysfs_mutex);
+	sysfs_refresh_inode(sd, inode);
+	mutex_unlock(&sysfs_mutex);
+
+	return generic_permission(inode, mask, NULL);
+}

fs/sysfs/symlink.c

@@ -210,10 +210,13 @@ static void sysfs_put_link(struct dentry *dentry, struct nameidata *nd, void *co
 }
 
 const struct inode_operations sysfs_symlink_inode_operations = {
-	.setxattr = sysfs_setxattr,
-	.readlink = generic_readlink,
-	.follow_link = sysfs_follow_link,
-	.put_link = sysfs_put_link,
+	.setxattr	= sysfs_setxattr,
+	.readlink	= generic_readlink,
+	.follow_link	= sysfs_follow_link,
+	.put_link	= sysfs_put_link,
+	.setattr	= sysfs_setattr,
+	.getattr	= sysfs_getattr,
+	.permission	= sysfs_permission,
 };
 
 

fs/sysfs/sysfs.h

@@ -89,9 +89,7 @@ static inline unsigned int sysfs_type(struct sysfs_dirent *sd)
  */
 struct sysfs_addrm_cxt {
 	struct sysfs_dirent	*parent_sd;
-	struct inode		*parent_inode;
 	struct sysfs_dirent	*removed;
-	int			cnt;
 };
 
 /*
@@ -105,7 +103,6 @@ extern struct kmem_cache *sysfs_dir_cachep;
  * dir.c
  */
 extern struct mutex sysfs_mutex;
-extern struct mutex sysfs_rename_mutex;
 extern spinlock_t sysfs_assoc_lock;
 
 extern const struct file_operations sysfs_dir_operations;
@@ -133,6 +130,9 @@ int sysfs_create_subdir(struct kobject *kobj, const char *name,
 			struct sysfs_dirent **p_sd);
 void sysfs_remove_subdir(struct sysfs_dirent *sd);
 
+int sysfs_rename(struct sysfs_dirent *sd,
+	struct sysfs_dirent *new_parent_sd, const char *new_name);
+
 static inline struct sysfs_dirent *__sysfs_get(struct sysfs_dirent *sd)
 {
 	if (sd) {
@@ -155,7 +155,10 @@ static inline void __sysfs_put(struct sysfs_dirent *sd)
  */
 struct inode *sysfs_get_inode(struct sysfs_dirent *sd);
 void sysfs_delete_inode(struct inode *inode);
+int sysfs_sd_setattr(struct sysfs_dirent *sd, struct iattr *iattr);
+int sysfs_permission(struct inode *inode, int mask);
 int sysfs_setattr(struct dentry *dentry, struct iattr *iattr);
+int sysfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat);
 int sysfs_setxattr(struct dentry *dentry, const char *name, const void *value,
 		size_t size, int flags);
 int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const char *name);

include/linux/device.h

@@ -558,7 +558,7 @@ extern void wait_for_device_probe(void);
 #ifdef CONFIG_DEVTMPFS
 extern int devtmpfs_create_node(struct device *dev);
 extern int devtmpfs_delete_node(struct device *dev);
-extern int devtmpfs_mount(const char *mountpoint);
+extern int devtmpfs_mount(const char *mntdir);
 #else
 static inline int devtmpfs_create_node(struct device *dev) { return 0; }
 static inline int devtmpfs_delete_node(struct device *dev) { return 0; }

include/linux/firmware.h

@@ -4,6 +4,7 @@
 #include <linux/module.h>
 #include <linux/types.h>
 #include <linux/compiler.h>
+#include <linux/gfp.h>
 
 #define FW_ACTION_NOHOTPLUG 0
 #define FW_ACTION_HOTPLUG 1
@@ -38,7 +39,7 @@ int request_firmware(const struct firmware **fw, const char *name,
 		     struct device *device);
 int request_firmware_nowait(
 	struct module *module, int uevent,
-	const char *name, struct device *device, void *context,
+	const char *name, struct device *device, gfp_t gfp, void *context,
 	void (*cont)(const struct firmware *fw, void *context));
 
 void release_firmware(const struct firmware *fw);
@@ -51,7 +52,7 @@ static inline int request_firmware(const struct firmware **fw,
 }
 static inline int request_firmware_nowait(
 	struct module *module, int uevent,
-	const char *name, struct device *device, void *context,
+	const char *name, struct device *device, gfp_t gfp, void *context,
 	void (*cont)(const struct firmware *fw, void *context))
 {
 	return -EINVAL;

include/linux/namei.h

@@ -76,7 +76,6 @@ extern struct file *nameidata_to_filp(struct nameidata *nd, int flags);
 extern void release_open_intent(struct nameidata *);
 
 extern struct dentry *lookup_one_len(const char *, struct dentry *, int);
-extern struct dentry *lookup_one_noperm(const char *, struct dentry *);
 
 extern int follow_down(struct path *);
 extern int follow_up(struct path *);

include/linux/platform_device.h

@@ -83,6 +83,8 @@ struct early_platform_driver {
 	struct platform_driver *pdrv;
 	struct list_head list;
 	int requested_id;
+	char *buffer;
+	int bufsize;
 };
 
 #define EARLY_PLATFORM_ID_UNSET -2
@@ -102,21 +104,29 @@ extern int early_platform_driver_probe(char *class_str,
 				       int nr_probe, int user_only);
 extern void early_platform_cleanup(void);
 
+#define early_platform_init(class_string, platdrv)		\
+	early_platform_init_buffer(class_string, platdrv, NULL, 0)
 
 #ifndef MODULE
-#define early_platform_init(class_string, platform_driver)		\
+#define early_platform_init_buffer(class_string, platdrv, buf, bufsiz)	\
 static __initdata struct early_platform_driver early_driver = {		\
 	.class_str = class_string,					\
-	.pdrv = platform_driver,					\
+	.buffer = buf,							\
+	.bufsize = bufsiz,						\
+	.pdrv = platdrv,						\
 	.requested_id = EARLY_PLATFORM_ID_UNSET,			\
 };									\
-static int __init early_platform_driver_setup_func(char *buf)		\
+static int __init early_platform_driver_setup_func(char *buffer)	\
 {									\
-	return early_platform_driver_register(&early_driver, buf);	\
+	return early_platform_driver_register(&early_driver, buffer);	\
 }									\
 early_param(class_string, early_platform_driver_setup_func)
 #else /* MODULE */
-#define early_platform_init(class_string, platform_driver)
+#define early_platform_init_buffer(class_string, platdrv, buf, bufsiz)	\
+static inline char *early_platform_driver_setup_func(void)		\
+{									\
+	return bufsiz ? buf : NULL;					\
+}
 #endif /* MODULE */
 
 #endif /* _PLATFORM_DEVICE_H_ */