xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

[PATCH] convert pm_sem to a mutex

Browse Source 
The power management semaphore is only used as mutex, so convert it.

[akpm@osdl.org: fix rotten bug]
Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Acked-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Pavel Machek <pavel@ucw.cz>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Stephen Hemminger
2006-12-06 20:34:35 -08:00
committed by Linus Torvalds
parent 3eb1b3a407
commit a6d7098060
4 changed files with 28 additions and 26 deletions
Download Patch File Download Diff File Expand all files Collapse all files

24
kernel/power/user.c
View File

@@ -79,10 +79,10 @@ static int snapshot_release(struct inode *inode, struct file *filp)
free_all_swap_pages(data->swap, data->bitmap);
free_bitmap(data->bitmap);
if (data->frozen) {
down(&pm_sem);
mutex_lock(&pm_mutex);
thaw_processes();
enable_nonboot_cpus();
up(&pm_sem);
mutex_unlock(&pm_mutex);
}
atomic_inc(&device_available);
return 0;
@@ -144,7 +144,7 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp,
case SNAPSHOT_FREEZE:
if (data->frozen)
break;
down(&pm_sem);
mutex_lock(&pm_mutex);
error = disable_nonboot_cpus();
if (!error) {
error = freeze_processes();
@@ -154,7 +154,7 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp,
error = -EBUSY;
}
}
up(&pm_sem);
mutex_unlock(&pm_mutex);
if (!error)
data->frozen = 1;
break;
@@ -162,10 +162,10 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp,
case SNAPSHOT_UNFREEZE:
if (!data->frozen)
break;
down(&pm_sem);
mutex_lock(&pm_mutex);
thaw_processes();
enable_nonboot_cpus();
up(&pm_sem);
mutex_unlock(&pm_mutex);
data->frozen = 0;
break;
@@ -174,7 +174,7 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp,
error = -EPERM;
break;
}
down(&pm_sem);
mutex_lock(&pm_mutex);
/* Free memory before shutting down devices. */
error = swsusp_shrink_memory();
if (!error) {
@@ -187,7 +187,7 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp,
}
resume_console();
}
up(&pm_sem);
mutex_unlock(&pm_mutex);
if (!error)
error = put_user(in_suspend, (unsigned int __user *)arg);
if (!error)
@@ -201,7 +201,7 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp,
error = -EPERM;
break;
}
down(&pm_sem);
mutex_lock(&pm_mutex);
pm_prepare_console();
suspend_console();
error = device_suspend(PMSG_PRETHAW);
@@ -211,7 +211,7 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp,
}
resume_console();
pm_restore_console();
up(&pm_sem);
mutex_unlock(&pm_mutex);
break;
case SNAPSHOT_FREE:
@@ -286,7 +286,7 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp,
break;
}
if (down_trylock(&pm_sem)) {
if (!mutex_trylock(&pm_mutex)) {
error = -EBUSY;
break;
}
@@ -314,7 +314,7 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp,
pm_ops->finish(PM_SUSPEND_MEM);
OutS3:
up(&pm_sem);
mutex_unlock(&pm_mutex);
break;
case SNAPSHOT_PMOPS: