From: Ingo Molnar <mingo@elte.hu>
Date: Fri, 5 Aug 2005 21:05:27 +0000 (+0200)
Subject: [PATCH] Fix semundo lock leakage
X-Git-Tag: v2.6.13-rc6~27
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=00a5dfdb93f74e4d95fb0d83c890728e331f8810;p=pandora-kernel.git

[PATCH] Fix semundo lock leakage

semundo->lock can leak if semundo->refcount goes from 2 to 1 while
another thread has it locked.  This causes major problems for PREEMPT
kernels.

The simplest fix for now is to undo the single-thread optimization.

This bug was found via relentless testing by Dominik Karall.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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