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authorDominik Brodowski <linux@dominikbrodowski.net>2010-01-16 09:14:11 +0100
committerDominik Brodowski <linux@dominikbrodowski.net>2010-02-17 17:48:20 +0100
commit00ce99ff506a17882747a7d6874e3f5206a99043 (patch)
tree571f5b106f25f35f326d456123c4af85147c3bce /drivers/pcmcia/pcmcia_ioctl.c
parentpcmcia: add locking to struct pcmcia_socket->pcmcia_state() (diff)
downloadlinux-00ce99ff506a17882747a7d6874e3f5206a99043.tar.xz
linux-00ce99ff506a17882747a7d6874e3f5206a99043.zip
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>
Diffstat (limited to 'drivers/pcmcia/pcmcia_ioctl.c')
-rw-r--r--drivers/pcmcia/pcmcia_ioctl.c36
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) {