[PATCH] pcmcia: use mutexes instead of semaphores

Use mutexes in the PCMICA core, as they suffice for what needs to be done.
Includes a bugfix from and Signed-off-by Andrew Morton.
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>

drivers/pcmcia/cs.c

@@ -111,9 +111,9 @@ int pcmcia_socket_dev_suspend(struct device *dev, pm_message_t state)
 	list_for_each_entry(socket, &pcmcia_socket_list, socket_list) {
 		if (socket->dev.dev != dev)
 			continue;
-		down(&socket->skt_sem);
+		mutex_lock(&socket->skt_mutex);
 		socket_suspend(socket);
-		up(&socket->skt_sem);
+		mutex_unlock(&socket->skt_mutex);
 	}
 	up_read(&pcmcia_socket_list_rwsem);
 
@@ -129,9 +129,9 @@ int pcmcia_socket_dev_resume(struct device *dev)
 	list_for_each_entry(socket, &pcmcia_socket_list, socket_list) {
 		if (socket->dev.dev != dev)
 			continue;
-		down(&socket->skt_sem);
+		mutex_lock(&socket->skt_mutex);
 		socket_resume(socket);
-		up(&socket->skt_sem);
+		mutex_unlock(&socket->skt_mutex);
 	}
 	up_read(&pcmcia_socket_list_rwsem);
 
@@ -237,7 +237,7 @@ int pcmcia_register_socket(struct pcmcia_socket *socket)
 	init_completion(&socket->socket_released);
 	init_completion(&socket->thread_done);
 	init_waitqueue_head(&socket->thread_wait);
-	init_MUTEX(&socket->skt_sem);
+	mutex_init(&socket->skt_mutex);
 	spin_lock_init(&socket->thread_lock);
 
 	ret = kernel_thread(pccardd, socket, CLONE_KERNEL);
@@ -662,7 +662,7 @@ static int pccardd(void *__skt)
 		spin_unlock_irqrestore(&skt->thread_lock, flags);
 
 		if (events) {
-			down(&skt->skt_sem);
+			mutex_lock(&skt->skt_mutex);
 			if (events & SS_DETECT)
 				socket_detect_change(skt);
 			if (events & SS_BATDEAD)
@@ -671,7 +671,7 @@ static int pccardd(void *__skt)
 				send_event(skt, CS_EVENT_BATTERY_LOW, CS_EVENT_PRI_LOW);
 			if (events & SS_READY)
 				send_event(skt, CS_EVENT_READY_CHANGE, CS_EVENT_PRI_LOW);
-			up(&skt->skt_sem);
+			mutex_unlock(&skt->skt_mutex);
 			continue;
 		}
 
@@ -715,8 +715,8 @@ int pccard_register_pcmcia(struct pcmcia_socket *s, struct pcmcia_callback *c)
 {
         int ret = 0;
 
-	/* s->skt_sem also protects s->callback */
-	down(&s->skt_sem);
+	/* s->skt_mutex also protects s->callback */
+	mutex_lock(&s->skt_mutex);
 
 	if (c) {
 		/* registration */
@@ -732,7 +732,7 @@ int pccard_register_pcmcia(struct pcmcia_socket *s, struct pcmcia_callback *c)
 	} else
 		s->callback = NULL;
  err:
-	up(&s->skt_sem);
+	mutex_unlock(&s->skt_mutex);
 
 	return ret;
 }
@@ -750,7 +750,7 @@ int pccard_reset_card(struct pcmcia_socket *skt)
 
 	cs_dbg(skt, 1, "resetting socket\n");
 
-	down(&skt->skt_sem);
+	mutex_lock(&skt->skt_mutex);
 	do {
 		if (!(skt->state & SOCKET_PRESENT)) {
 			ret = CS_NO_CARD;
@@ -779,7 +779,7 @@ int pccard_reset_card(struct pcmcia_socket *skt)
 
 		ret = CS_SUCCESS;
 	} while (0);
-	up(&skt->skt_sem);
+	mutex_unlock(&skt->skt_mutex);
 
 	return ret;
 } /* reset_card */
@@ -795,7 +795,7 @@ int pcmcia_suspend_card(struct pcmcia_socket *skt)
 
 	cs_dbg(skt, 1, "suspending socket\n");
 
-	down(&skt->skt_sem);
+	mutex_lock(&skt->skt_mutex);
 	do {
 		if (!(skt->state & SOCKET_PRESENT)) {
 			ret = CS_NO_CARD;
@@ -812,7 +812,7 @@ int pcmcia_suspend_card(struct pcmcia_socket *skt)
 		}
 		ret = socket_suspend(skt);
 	} while (0);
-	up(&skt->skt_sem);
+	mutex_unlock(&skt->skt_mutex);
 
 	return ret;
 } /* suspend_card */
@@ -825,7 +825,7 @@ int pcmcia_resume_card(struct pcmcia_socket *skt)
     
 	cs_dbg(skt, 1, "waking up socket\n");
 
-	down(&skt->skt_sem);
+	mutex_lock(&skt->skt_mutex);
 	do {
 		if (!(skt->state & SOCKET_PRESENT)) {
 			ret = CS_NO_CARD;
@@ -839,7 +839,7 @@ int pcmcia_resume_card(struct pcmcia_socket *skt)
 		if (!ret && skt->callback)
 			skt->callback->resume(skt);
 	} while (0);
-	up(&skt->skt_sem);
+	mutex_unlock(&skt->skt_mutex);
 
 	return ret;
 } /* resume_card */
@@ -853,7 +853,7 @@ int pcmcia_eject_card(struct pcmcia_socket *skt)
     
 	cs_dbg(skt, 1, "user eject request\n");
 
-	down(&skt->skt_sem);
+	mutex_lock(&skt->skt_mutex);
 	do {
 		if (!(skt->state & SOCKET_PRESENT)) {
 			ret = -ENODEV;
@@ -869,7 +869,7 @@ int pcmcia_eject_card(struct pcmcia_socket *skt)
 		socket_remove(skt);
 		ret = 0;
 	} while (0);
-	up(&skt->skt_sem);
+	mutex_unlock(&skt->skt_mutex);
 
 	return ret;
 } /* eject_card */
@@ -882,7 +882,7 @@ int pcmcia_insert_card(struct pcmcia_socket *skt)
 
 	cs_dbg(skt, 1, "user insert request\n");
 
-	down(&skt->skt_sem);
+	mutex_lock(&skt->skt_mutex);
 	do {
 		if (skt->state & SOCKET_PRESENT) {
 			ret = -EBUSY;
@@ -894,7 +894,7 @@ int pcmcia_insert_card(struct pcmcia_socket *skt)
 		}
 		ret = 0;
 	} while (0);
-	up(&skt->skt_sem);
+	mutex_unlock(&skt->skt_mutex);
 
 	return ret;
 } /* insert_card */

drivers/pcmcia/ds.c

@@ -564,7 +564,7 @@ static int pcmcia_device_query(struct pcmcia_device *p_dev)
  * won't work, this doesn't matter much at the moment: the driver core doesn't
  * support it either.
  */
-static DECLARE_MUTEX(device_add_lock);
+static DEFINE_MUTEX(device_add_lock);
 
 struct pcmcia_device * pcmcia_device_add(struct pcmcia_socket *s, unsigned int function)
 {
@@ -576,7 +576,7 @@ struct pcmcia_device * pcmcia_device_add(struct pcmcia_socket *s, unsigned int f
 	if (!s)
 		return NULL;
 
-	down(&device_add_lock);
+	mutex_lock(&device_add_lock);
 
 	/* max of 2 devices per card */
 	if (s->device_count == 2)
@@ -640,7 +640,7 @@ struct pcmcia_device * pcmcia_device_add(struct pcmcia_socket *s, unsigned int f
 	if (device_register(&p_dev->dev))
 		goto err_unreg;
 
-	up(&device_add_lock);
+	mutex_unlock(&device_add_lock);
 
 	return p_dev;
 
@@ -654,7 +654,7 @@ struct pcmcia_device * pcmcia_device_add(struct pcmcia_socket *s, unsigned int f
 	kfree(p_dev);
 	s->device_count--;
  err_put:
-	up(&device_add_lock);
+	mutex_unlock(&device_add_lock);
 	pcmcia_put_socket(s);
 
 	return NULL;
@@ -713,7 +713,7 @@ static void pcmcia_bus_rescan(struct pcmcia_socket *skt)
 	int no_devices=0;
 	unsigned long flags;
 
-	/* must be called with skt_sem held */
+	/* must be called with skt_mutex held */
 	spin_lock_irqsave(&pcmcia_dev_list_lock, flags);
 	if (list_empty(&skt->devices_list))
 		no_devices=1;
@@ -999,9 +999,9 @@ static ssize_t pcmcia_store_allow_func_id_match(struct device *dev,
 	if (!count)
 		return -EINVAL;
 
-	down(&p_dev->socket->skt_sem);
+	mutex_lock(&p_dev->socket->skt_mutex);
 	p_dev->allow_func_id_match = 1;
-	up(&p_dev->socket->skt_sem);
+	mutex_unlock(&p_dev->socket->skt_mutex);
 
 	bus_rescan_devices(&pcmcia_bus_type);
 

drivers/pcmcia/pcmcia_ioctl.c

@@ -269,9 +269,9 @@ static int bind_request(struct pcmcia_socket *s, bind_info_t *bind_info)
 	/*
 	 * Prevent this racing with a card insertion.
 	 */
-	down(&s->skt_sem);
+	mutex_lock(&s->skt_mutex);
 	bus_rescan_devices(&pcmcia_bus_type);
-	up(&s->skt_sem);
+	mutex_unlock(&s->skt_mutex);
 
 	/* check whether the driver indeed matched. I don't care if this
 	 * is racy or not, because it can only happen on cardmgr access
@@ -606,9 +606,9 @@ static int ds_ioctl(struct inode * inode, struct file * file,
 	}
 	break;
     case DS_GET_FIRST_TUPLE:
-	down(&s->skt_sem);
+	mutex_lock(&s->skt_mutex);
 	pcmcia_validate_mem(s);
-	up(&s->skt_sem);
+	mutex_unlock(&s->skt_mutex);
 	ret = pccard_get_first_tuple(s, BIND_FN_ALL, &buf->tuple);
 	break;
     case DS_GET_NEXT_TUPLE:
@@ -637,9 +637,9 @@ static int ds_ioctl(struct inode * inode, struct file * file,
 	    }
 	    break;
     case DS_VALIDATE_CIS:
-	down(&s->skt_sem);
+	mutex_lock(&s->skt_mutex);
 	pcmcia_validate_mem(s);
-	up(&s->skt_sem);
+	mutex_unlock(&s->skt_mutex);
 	ret = pccard_validate_cis(s, BIND_FN_ALL, &buf->cisinfo);
 	break;
     case DS_SUSPEND_CARD:

drivers/pcmcia/rsrc_nonstatic.c

@@ -61,7 +61,7 @@ struct socket_data {
 	unsigned int			rsrc_mem_probe;
 };
 
-static DECLARE_MUTEX(rsrc_sem);
+static DEFINE_MUTEX(rsrc_mutex);
 #define MEM_PROBE_LOW	(1 << 0)
 #define MEM_PROBE_HIGH	(1 << 1)
 
@@ -484,7 +484,7 @@ static int validate_mem(struct pcmcia_socket *s, unsigned int probe_mask)
 
 
 /*
- * Locking note: Must be called with skt_sem held!
+ * Locking note: Must be called with skt_mutex held!
  */
 static int pcmcia_nonstatic_validate_mem(struct pcmcia_socket *s)
 {
@@ -495,7 +495,7 @@ static int pcmcia_nonstatic_validate_mem(struct pcmcia_socket *s)
 	if (!probe_mem)
 		return 0;
 
-	down(&rsrc_sem);
+	mutex_lock(&rsrc_mutex);
 
 	if (s->features & SS_CAP_PAGE_REGS)
 		probe_mask = MEM_PROBE_HIGH;
@@ -507,7 +507,7 @@ static int pcmcia_nonstatic_validate_mem(struct pcmcia_socket *s)
 			s_data->rsrc_mem_probe |= probe_mask;
 	}
 
-	up(&rsrc_sem);
+	mutex_unlock(&rsrc_mutex);
 
 	return ret;
 }
@@ -585,7 +585,7 @@ static int nonstatic_adjust_io_region(struct resource *res, unsigned long r_star
 	struct socket_data *s_data = s->resource_data;
 	int ret = -ENOMEM;
 
-	down(&rsrc_sem);
+	mutex_lock(&rsrc_mutex);
 	for (m = s_data->io_db.next; m != &s_data->io_db; m = m->next) {
 		unsigned long start = m->base;
 		unsigned long end = m->base + m->num - 1;
@@ -596,7 +596,7 @@ static int nonstatic_adjust_io_region(struct resource *res, unsigned long r_star
 		ret = adjust_resource(res, r_start, r_end - r_start + 1);
 		break;
 	}
-	up(&rsrc_sem);
+	mutex_unlock(&rsrc_mutex);
 
 	return ret;
 }
@@ -630,7 +630,7 @@ static struct resource *nonstatic_find_io_region(unsigned long base, int num,
 	data.offset = base & data.mask;
 	data.map = &s_data->io_db;
 
-	down(&rsrc_sem);
+	mutex_lock(&rsrc_mutex);
 #ifdef CONFIG_PCI
 	if (s->cb_dev) {
 		ret = pci_bus_alloc_resource(s->cb_dev->bus, res, num, 1,
@@ -639,7 +639,7 @@ static struct resource *nonstatic_find_io_region(unsigned long base, int num,
 #endif
 		ret = allocate_resource(&ioport_resource, res, num, min, ~0UL,
 					1, pcmcia_align, &data);
-	up(&rsrc_sem);
+	mutex_unlock(&rsrc_mutex);
 
 	if (ret != 0) {
 		kfree(res);
@@ -672,7 +672,7 @@ static struct resource * nonstatic_find_mem_region(u_long base, u_long num,
 			min = 0x100000UL + base;
 		}
 
-		down(&rsrc_sem);
+		mutex_lock(&rsrc_mutex);
 #ifdef CONFIG_PCI
 		if (s->cb_dev) {
 			ret = pci_bus_alloc_resource(s->cb_dev->bus, res, num,
@@ -682,7 +682,7 @@ static struct resource * nonstatic_find_mem_region(u_long base, u_long num,
 #endif
 			ret = allocate_resource(&iomem_resource, res, num, min,
 						max, 1, pcmcia_align, &data);
-		up(&rsrc_sem);
+		mutex_unlock(&rsrc_mutex);
 		if (ret == 0 || low)
 			break;
 		low = 1;
@@ -705,7 +705,7 @@ static int adjust_memory(struct pcmcia_socket *s, unsigned int action, unsigned
 	if (end < start)
 		return -EINVAL;
 
-	down(&rsrc_sem);
+	mutex_lock(&rsrc_mutex);
 	switch (action) {
 	case ADD_MANAGED_RESOURCE:
 		ret = add_interval(&data->mem_db, start, size);
@@ -723,7 +723,7 @@ static int adjust_memory(struct pcmcia_socket *s, unsigned int action, unsigned
 	default:
 		ret = -EINVAL;
 	}
-	up(&rsrc_sem);
+	mutex_unlock(&rsrc_mutex);
 
 	return ret;
 }
@@ -741,7 +741,7 @@ static int adjust_io(struct pcmcia_socket *s, unsigned int action, unsigned long
 	if (end > IO_SPACE_LIMIT)
 		return -EINVAL;
 
-	down(&rsrc_sem);
+	mutex_lock(&rsrc_mutex);
 	switch (action) {
 	case ADD_MANAGED_RESOURCE:
 		if (add_interval(&data->io_db, start, size) != 0) {
@@ -760,7 +760,7 @@ static int adjust_io(struct pcmcia_socket *s, unsigned int action, unsigned long
 		ret = -EINVAL;
 		break;
 	}
-	up(&rsrc_sem);
+	mutex_unlock(&rsrc_mutex);
 
 	return ret;
 }
@@ -867,7 +867,7 @@ static void nonstatic_release_resource_db(struct pcmcia_socket *s)
 	struct socket_data *data = s->resource_data;
 	struct resource_map *p, *q;
 
-	down(&rsrc_sem);
+	mutex_lock(&rsrc_mutex);
 	for (p = data->mem_db.next; p != &data->mem_db; p = q) {
 		q = p->next;
 		kfree(p);
@@ -876,7 +876,7 @@ static void nonstatic_release_resource_db(struct pcmcia_socket *s)
 		q = p->next;
 		kfree(p);
 	}
-	up(&rsrc_sem);
+	mutex_unlock(&rsrc_mutex);
 }
 
 
@@ -901,7 +901,7 @@ static ssize_t show_io_db(struct class_device *class_dev, char *buf)
 	struct resource_map *p;
 	ssize_t ret = 0;
 
-	down(&rsrc_sem);
+	mutex_lock(&rsrc_mutex);
 	data = s->resource_data;
 
 	for (p = data->io_db.next; p != &data->io_db; p = p->next) {
@@ -913,7 +913,7 @@ static ssize_t show_io_db(struct class_device *class_dev, char *buf)
 				 ((unsigned long) p->base + p->num - 1));
 	}
 
-	up(&rsrc_sem);
+	mutex_unlock(&rsrc_mutex);
 	return (ret);
 }
 
@@ -953,7 +953,7 @@ static ssize_t show_mem_db(struct class_device *class_dev, char *buf)
 	struct resource_map *p;
 	ssize_t ret = 0;
 
-	down(&rsrc_sem);
+	mutex_lock(&rsrc_mutex);
 	data = s->resource_data;
 
 	for (p = data->mem_db.next; p != &data->mem_db; p = p->next) {
@@ -965,7 +965,7 @@ static ssize_t show_mem_db(struct class_device *class_dev, char *buf)
 				 ((unsigned long) p->base + p->num - 1));
 	}
 
-	up(&rsrc_sem);
+	mutex_unlock(&rsrc_mutex);
 	return (ret);
 }
 

drivers/pcmcia/socket_sysfs.c

@@ -25,6 +25,7 @@
 #include <linux/pm.h>
 #include <linux/pci.h>
 #include <linux/device.h>
+#include <linux/mutex.h>
 #include <asm/system.h>
 #include <asm/irq.h>
 
@@ -183,7 +184,7 @@ static ssize_t pccard_store_resource(struct class_device *dev, const char *buf,
 		s->resource_setup_done = 1;
 	spin_unlock_irqrestore(&s->lock, flags);
 
-	down(&s->skt_sem);
+	mutex_lock(&s->skt_mutex);
 	if ((s->callback) &&
 	    (s->state & SOCKET_PRESENT) &&
 	    !(s->state & SOCKET_CARDBUS)) {
@@ -192,7 +193,7 @@ static ssize_t pccard_store_resource(struct class_device *dev, const char *buf,
 			module_put(s->callback->owner);
 		}
 	}
-	up(&s->skt_sem);
+	mutex_unlock(&s->skt_mutex);
 
 	return count;
 }
@@ -322,7 +323,7 @@ static ssize_t pccard_store_cis(struct kobject *kobj, char *buf, loff_t off, siz
 	kfree(cis);
 
 	if (!ret) {
-		down(&s->skt_sem);
+		mutex_lock(&s->skt_mutex);
 		if ((s->callback) && (s->state & SOCKET_PRESENT) &&
 		    !(s->state & SOCKET_CARDBUS)) {
 			if (try_module_get(s->callback->owner)) {
@@ -330,7 +331,7 @@ static ssize_t pccard_store_cis(struct kobject *kobj, char *buf, loff_t off, siz
 				module_put(s->callback->owner);
 			}
 		}
-		up(&s->skt_sem);
+		mutex_unlock(&s->skt_mutex);
 	}
 
 

include/pcmcia/ss.h

@@ -18,6 +18,7 @@
 #include <linux/config.h>
 #include <linux/device.h>
 #include <linux/sched.h>	/* task_struct, completion */
+#include <linux/mutex.h>
 
 #include <pcmcia/cs_types.h>
 #include <pcmcia/cs.h>
@@ -240,7 +241,7 @@ struct pcmcia_socket {
 #endif
 
 	/* state thread */
-	struct semaphore		skt_sem;	/* protects socket h/w state */
+	struct mutex			skt_mutex;	/* protects socket h/w state */
 
 	struct task_struct		*thread;
 	struct completion		thread_done;