pcmcia: simplify locking

replace pcmcia_socket->lock and pcmcia_dev_list_lock by using the
per-socket "ops_mutex", as we do neither need different locks
nor a spinlock here.

Tested-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>

1 files changed, 16 insertions, 20 deletions

diff --git a/drivers/pcmcia/pcmcia_ioctl.c b/drivers/pcmcia/pcmcia_ioctl.c
index f73fd5beaa37..db2e3db8008b 100644
--- a/drivers/pcmcia/pcmcia_ioctl.c
+++ b/drivers/pcmcia/pcmcia_ioctl.c
@@ -62,16 +62,15 @@ static struct pcmcia_device *get_pcmcia_device(struct pcmcia_socket *s,
                                                 unsigned int function)
 {
         struct pcmcia_device *p_dev = NULL;
-        unsigned long flags;
 
-        spin_lock_irqsave(&pcmcia_dev_list_lock, flags);
+        mutex_lock(&s->ops_mutex);
         list_for_each_entry(p_dev, &s->devices_list, socket_device_list) {
                 if (p_dev->func == function) {
-                        spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
+                        mutex_unlock(&s->ops_mutex);
                         return pcmcia_get_dev(p_dev);
                 }
         }
-        spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
+        mutex_unlock(&s->ops_mutex);
         return NULL;
 }
 
@@ -169,7 +168,6 @@ static int pcmcia_adjust_resource_info(adjust_t *adj)
 {
         struct pcmcia_socket *s;
         int ret = -ENOSYS;
-        unsigned long flags;
 
         down_read(&pcmcia_socket_list_rwsem);
         list_for_each_entry(s, &pcmcia_socket_list, socket_list) {
@@ -182,14 +180,14 @@ static int pcmcia_adjust_resource_info(adjust_t *adj)
 
                         /* you can't use the old interface if the new
                          * one was used before */
-                        spin_lock_irqsave(&s->lock, flags);
+                        mutex_lock(&s->ops_mutex);
                         if ((s->resource_setup_new) &&
                             !(s->resource_setup_old)) {
-                                spin_unlock_irqrestore(&s->lock, flags);
+                                mutex_unlock(&s->ops_mutex);
                                 continue;
                         } else if (!(s->resource_setup_old))
                                 s->resource_setup_old = 1;
-                        spin_unlock_irqrestore(&s->lock, flags);
+                        mutex_unlock(&s->ops_mutex);
 
                         switch (adj->Resource) {
                         case RES_MEMORY_RANGE:
@@ -208,9 +206,9 @@ static int pcmcia_adjust_resource_info(adjust_t *adj)
                                  * last call to adjust_resource_info, we
                                  * always need to assume this is the latest
                                  * one... */
-                                spin_lock_irqsave(&s->lock, flags);
+                                mutex_lock(&s->ops_mutex);
                                 s->resource_setup_done = 1;
-                                spin_unlock_irqrestore(&s->lock, flags);
+                                mutex_unlock(&s->ops_mutex);
                         }
                 }
         }
@@ -470,7 +468,6 @@ static int bind_request(struct pcmcia_socket *s, bind_info_t *bind_info)
         struct pcmcia_driver *p_drv;
         struct pcmcia_device *p_dev;
         int ret = 0;
-        unsigned long flags;
 
         s = pcmcia_get_socket(s);
         if (!s)
@@ -490,7 +487,7 @@ static int bind_request(struct pcmcia_socket *s, bind_info_t *bind_info)
                 goto err_put_driver;
         }
 
-        spin_lock_irqsave(&pcmcia_dev_list_lock, flags);
+        mutex_lock(&s->ops_mutex);
         list_for_each_entry(p_dev, &s->devices_list, socket_device_list) {
                 if (p_dev->func == bind_info->function) {
                         if ((p_dev->dev.driver == &p_drv->drv)) {
@@ -499,7 +496,7 @@ static int bind_request(struct pcmcia_socket *s, bind_info_t *bind_info)
                                          * registered, and it was registered
                                          * by userspace before, we need to
                                          * return the "instance". */
-                                        spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
+                                        mutex_unlock(&s->ops_mutex);
                                         bind_info->instance = p_dev;
                                         ret = -EBUSY;
                                         goto err_put_module;
@@ -507,7 +504,7 @@ static int bind_request(struct pcmcia_socket *s, bind_info_t *bind_info)
                                         /* the correct driver managed to bind
                                          * itself magically to the correct
                                          * device. */
-                                        spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
+                                        mutex_unlock(&s->ops_mutex);
                                         p_dev->cardmgr = p_drv;
                                         ret = 0;
                                         goto err_put_module;
@@ -516,12 +513,12 @@ static int bind_request(struct pcmcia_socket *s, bind_info_t *bind_info)
                                 /* there's already a device available where
                                  * no device has been bound to yet. So we don't
                                  * need to register a device! */
-                                spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
+                                mutex_unlock(&s->ops_mutex);
                                 goto rescan;
                         }
                 }
         }
-        spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
+        mutex_unlock(&s->ops_mutex);
 
         p_dev = pcmcia_device_add(s, bind_info->function);
         if (!p_dev) {
@@ -578,7 +575,6 @@ static int get_device_info(struct pcmcia_socket *s, bind_info_t *bind_info, int
         dev_node_t *node;
         struct pcmcia_device *p_dev;
         struct pcmcia_driver *p_drv;
-        unsigned long flags;
         int ret = 0;
 
 #ifdef CONFIG_CARDBUS
@@ -617,7 +613,7 @@ static int get_device_info(struct pcmcia_socket *s, bind_info_t *bind_info, int
         }
 #endif
 
-        spin_lock_irqsave(&pcmcia_dev_list_lock, flags);
+        mutex_lock(&s->ops_mutex);
         list_for_each_entry(p_dev, &s->devices_list, socket_device_list) {
                 if (p_dev->func == bind_info->function) {
                         p_dev = pcmcia_get_dev(p_dev);
@@ -626,11 +622,11 @@ static int get_device_info(struct pcmcia_socket *s, bind_info_t *bind_info, int
                         goto found;
                 }
         }
-        spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
+        mutex_unlock(&s->ops_mutex);
         return -ENODEV;
 
  found:
-        spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
+        mutex_unlock(&s->ops_mutex);
 
         p_drv = to_pcmcia_drv(p_dev->dev.driver);
         if (p_drv && !p_dev->_locked) {