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fix refrigerator() vs thaw_process() race 

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

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Acked-by: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Oleg Nesterov 2007-05-06 14:50:40 -07:00 committed by Linus Torvalds
parent e87be11434
commit 433ecb4ab3
1 changed files with 4 additions and 2 deletions
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6
kernel/power/process.c
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@ -47,8 +47,10 @@ void refrigerator(void)
recalc_sigpending(); /* We sent fake signal, clean it up */ recalc_sigpending(); /* We sent fake signal, clean it up */
spin_unlock_irq(&current->sighand->siglock); spin_unlock_irq(&current->sighand->siglock);
while (frozen(current)) { for (;;) {
current->state = TASK_UNINTERRUPTIBLE; set_current_state(TASK_UNINTERRUPTIBLE);
if (!frozen(current))
break;
schedule(); schedule();
} }
pr_debug("%s left refrigerator\n", current->comm); pr_debug("%s left refrigerator\n", current->comm);