From: Oleg Nesterov <oleg@tv-sign.ru>
Date: Wed, 9 May 2007 09:34:20 +0000 (-0700)
Subject: worker_thread: fix racy try_to_freeze() usage
X-Git-Tag: v2.6.22-rc1~216
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=85f4186af944c1240c84934a9ab578743df2d69b;p=pandora-kernel.git

worker_thread: fix racy try_to_freeze() usage

worker_thread() can miss freeze_process()->signal_wake_up() if it happens
between try_to_freeze() and prepare_to_wait().  We should check freezing()
before entering schedule().

This race was introduced by me in

	[PATCH 1/1] workqueue: don't migrate pending works from the dead CPU

Looks like mm/vmscan.c:kswapd() has the same race.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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