Commit dd5d666b authored by Shaohua Li's avatar Shaohua Li Committed by Linus Torvalds

[PATCH] swsusp: add locking to software_resume

It is trying to protect swsusp_resume_device and software_resume() from two
users banging it from userspace at the same time.
Signed-off-by: default avatarShaohua Li <shaohua.li@intel.com>
Signed-off-by: default avatarPavel Machek <pavel@suse.cz>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 6ed9fcec
......@@ -233,9 +233,12 @@ static int software_resume(void)
{
int error;
down(&pm_sem);
if (!swsusp_resume_device) {
if (!strlen(resume_file))
if (!strlen(resume_file)) {
up(&pm_sem);
return -ENOENT;
}
swsusp_resume_device = name_to_dev_t(resume_file);
pr_debug("swsusp: Resume From Partition %s\n", resume_file);
} else {
......@@ -248,6 +251,7 @@ 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);
return 0;
}
......@@ -284,6 +288,8 @@ static int software_resume(void)
Cleanup:
unprepare_processes();
Done:
/* For success case, the suspend path will release the lock */
up(&pm_sem);
pr_debug("PM: Resume from disk failed.\n");
return 0;
}
......@@ -390,7 +396,9 @@ static ssize_t resume_store(struct subsystem * subsys, const char * buf, size_t
if (sscanf(buf, "%u:%u", &maj, &min) == 2) {
res = MKDEV(maj,min);
if (maj == MAJOR(res) && min == MINOR(res)) {
down(&pm_sem);
swsusp_resume_device = res;
up(&pm_sem);
printk("Attempting manual resume\n");
noresume = 0;
software_resume();
......
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