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[PATCH] convert pm_sem to a mutex

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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
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16
kernel/power/disk.c
View file

@ -213,10 +213,10 @@ static int software_resume(void)
{
int error;
down(&pm_sem);
mutex_lock(&pm_mutex);
if (!swsusp_resume_device) {
if (!strlen(resume_file)) {
up(&pm_sem);
mutex_unlock(&pm_mutex);
return -ENOENT;
}
swsusp_resume_device = name_to_dev_t(resume_file);
@ -231,7 +231,7 @@ static int software_resume(void)
* FIXME: If noresume is specified, we need to find the partition
* and reset it back to normal swap space.
*/
up(&pm_sem);
mutex_unlock(&pm_mutex);
return 0;
}
@ -275,7 +275,7 @@ static int software_resume(void)
unprepare_processes();
Done:
/* For success case, the suspend path will release the lock */
up(&pm_sem);
mutex_unlock(&pm_mutex);
pr_debug("PM: Resume from disk failed.\n");
return 0;
}
@ -336,7 +336,7 @@ static ssize_t disk_store(struct subsystem * s, const char * buf, size_t n)
p = memchr(buf, '\n', n);
len = p ? p - buf : n;
down(&pm_sem);
mutex_lock(&pm_mutex);
for (i = PM_DISK_FIRMWARE; i < PM_DISK_MAX; i++) {
if (!strncmp(buf, pm_disk_modes[i], len)) {
mode = i;
@ -360,7 +360,7 @@ static ssize_t disk_store(struct subsystem * s, const char * buf, size_t n)
pr_debug("PM: suspend-to-disk mode set to '%s'\n",
pm_disk_modes[mode]);
up(&pm_sem);
mutex_unlock(&pm_mutex);
return error ? error : n;
}
@ -385,9 +385,9 @@ static ssize_t resume_store(struct subsystem *subsys, const char *buf, size_t n)
if (maj != MAJOR(res) || min != MINOR(res))
goto out;
down(&pm_sem);
mutex_lock(&pm_mutex);
swsusp_resume_device = res;
up(&pm_sem);
mutex_unlock(&pm_mutex);
printk("Attempting manual resume\n");
noresume = 0;
software_resume();

10
kernel/power/main.c
View file

@ -25,7 +25,7 @@
/*This is just an arbitrary number */
#define FREE_PAGE_NUMBER (100)
DECLARE_MUTEX(pm_sem);
DEFINE_MUTEX(pm_mutex);
struct pm_ops *pm_ops;
suspend_disk_method_t pm_disk_mode = PM_DISK_SHUTDOWN;
@ -37,9 +37,9 @@ suspend_disk_method_t pm_disk_mode = PM_DISK_SHUTDOWN;
void pm_set_ops(struct pm_ops * ops)
{
down(&pm_sem);
mutex_lock(&pm_mutex);
pm_ops = ops;
up(&pm_sem);
mutex_unlock(&pm_mutex);
}
@ -183,7 +183,7 @@ static int enter_state(suspend_state_t state)
if (!valid_state(state))
return -ENODEV;
if (down_trylock(&pm_sem))
if (!mutex_trylock(&pm_mutex))
return -EBUSY;
if (state == PM_SUSPEND_DISK) {
@ -201,7 +201,7 @@ static int enter_state(suspend_state_t state)
pr_debug("PM: Finishing wakeup.\n");
suspend_finish(state);
Unlock:
up(&pm_sem);
mutex_unlock(&pm_mutex);
return error;
}

4
kernel/power/power.h
View file

@ -22,7 +22,9 @@ static inline int pm_suspend_disk(void)
return -EPERM;
}
#endif
extern struct semaphore pm_sem;
extern struct mutex pm_mutex;
#define power_attr(_name) \
static struct subsys_attribute _name##_attr = { \
.attr = { \

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: