From: Oleg Nesterov <oleg@tv-sign.ru>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>, Pavel Machek <pavel@ucw.cz>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
linux-kernel@vger.kernel.org
Subject: [PATCH] fix refrigerator() vs thaw_process() race
Date: Mon, 19 Feb 2007 01:17:37 +0300 [thread overview]
Message-ID: <20070218221737.GA4880@tv-sign.ru> (raw)
refrigerator() can miss a wakeup, "wait event" loop needs a proper memory
ordering.
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
--- WQ/kernel/power/process.c~WAKE 2007-02-18 22:56:49.000000000 +0300
+++ WQ/kernel/power/process.c 2007-02-19 01:04:26.000000000 +0300
@@ -46,8 +46,10 @@ void refrigerator(void)
recalc_sigpending(); /* We sent fake signal, clean it up */
spin_unlock_irq(¤t->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);
next reply other threads:[~2007-02-18 22:20 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-18 22:17 Oleg Nesterov [this message]
2007-02-18 23:28 ` [PATCH] fix refrigerator() vs thaw_process() race Rafael J. Wysocki
2007-02-19 10:50 ` Pavel Machek
2007-02-19 12:12 ` Oleg Nesterov
2007-02-19 22:47 ` Pavel Machek
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