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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
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@@ -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();