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PM / Sleep: Replace mutex_[un]lock(&pm_mutex) with [un]lock_system_sleep()

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Using [un]lock_system_sleep() is safer than directly using mutex_[un]lock()
on 'pm_mutex', since the latter could lead to freezing failures. Hence convert
all the present users of mutex_[un]lock(&pm_mutex) to use these safe APIs
instead.

Suggested-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Reviewed-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
This commit is contained in:
Srivatsa S. Bhat
2011-12-07 22:29:54 +01:00
committed by Rafael J. Wysocki
parent 9b6fc5dc87
commit bcda53faf5
5 changed files with 22 additions and 22 deletions
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16
kernel/power/user.c
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@ -71,7 +71,7 @@ static int snapshot_open(struct inode *inode, struct file *filp)
struct snapshot_data *data;
int error;
mutex_lock(&pm_mutex);
lock_system_sleep();
if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
error = -EBUSY;
@ -123,7 +123,7 @@ static int snapshot_open(struct inode *inode, struct file *filp)
data->platform_support = 0;
Unlock:
mutex_unlock(&pm_mutex);
unlock_system_sleep();
return error;
}
@ -132,7 +132,7 @@ static int snapshot_release(struct inode *inode, struct file *filp)
{
struct snapshot_data *data;
mutex_lock(&pm_mutex);
lock_system_sleep();
swsusp_free();
free_basic_memory_bitmaps();
@ -146,7 +146,7 @@ static int snapshot_release(struct inode *inode, struct file *filp)
PM_POST_HIBERNATION : PM_POST_RESTORE);
atomic_inc(&snapshot_device_available);
mutex_unlock(&pm_mutex);
unlock_system_sleep();
return 0;
}
@ -158,7 +158,7 @@ static ssize_t snapshot_read(struct file *filp, char __user *buf,
ssize_t res;
loff_t pg_offp = *offp & ~PAGE_MASK;
mutex_lock(&pm_mutex);
lock_system_sleep();
data = filp->private_data;
if (!data->ready) {
@ -179,7 +179,7 @@ static ssize_t snapshot_read(struct file *filp, char __user *buf,
*offp += res;
Unlock:
mutex_unlock(&pm_mutex);
unlock_system_sleep();
return res;
}
@ -191,7 +191,7 @@ static ssize_t snapshot_write(struct file *filp, const char __user *buf,
ssize_t res;
loff_t pg_offp = *offp & ~PAGE_MASK;
mutex_lock(&pm_mutex);
lock_system_sleep();
data = filp->private_data;
@ -208,7 +208,7 @@ static ssize_t snapshot_write(struct file *filp, const char __user *buf,
if (res > 0)
*offp += res;
unlock:
mutex_unlock(&pm_mutex);
unlock_system_sleep();
return res;
}