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Commit 433ecb4a authored by Oleg Nesterov's avatar Oleg Nesterov Committed by Linus Torvalds
Browse files

fix refrigerator() vs thaw_process() race 



refrigerator() can miss a wakeup, "wait event" loop needs a proper memory
ordering.

Signed-off-by: default avatarOleg Nesterov <oleg@tv-sign.ru>
Acked-by: default avatar"Rafael J. Wysocki" <rjw@sisk.pl>
Cc: Pavel Machek <pavel@ucw.cz>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent e87be114

kernel/power/process.c

+4 −2
Original line number Diff line number Diff line
@@ -47,8 +47,10 @@ void refrigerator(void) 
	recalc_sigpending(); /* We sent fake signal, clean it up */

	spin_unlock_irq(&current->sighand->siglock);



	while (frozen(current)) {

		current->state = TASK_UNINTERRUPTIBLE;

	for (;;) {

		set_current_state(TASK_UNINTERRUPTIBLE);

		if (!frozen(current))

			break;

		schedule();

	}

	pr_debug("%s left refrigerator\n", current->comm);