]> pilppa.com Git - linux-2.6-omap-h63xx.git/commit
rt-mutex: fix stale return value
authorThomas Gleixner <tglx@linutronix.de>
Fri, 8 Jun 2007 20:46:57 +0000 (13:46 -0700)
committerLinus Torvalds <torvalds@woody.linux-foundation.org>
Sat, 9 Jun 2007 00:23:34 +0000 (17:23 -0700)
commitc0d1d2bf5a28f78def7b68ca1eb5ba31aafd43a1
treec51260793d12005dcc244a1304193ce9898ed9cc
parent51b94d2a5a90d4800e74d7348bcde098a28f4fb3
rt-mutex: fix stale return value

Alexey Kuznetsov found some problems in the pi-futex code.

The major problem is a stale return value in rt_mutex_slowlock():

When the pi chain walk returns -EDEADLK, but the waiter was woken up during
the phases where the locks were dropped, the rtmutex could be acquired, but
due to the stale return value -EDEADLK returned to the caller.

Reset the return value in the retry path.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Ingo Molnar <mingo@elte.hu>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Cc: Ulrich Drepper <drepper@redhat.com>
Cc: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
kernel/rtmutex.c