Messages in this thread Patch in this message | | | Date | Thu, 21 Sep 2017 17:48:43 +0200 | From | Sebastian Andrzej Siewior <> | Subject | [PATCH RT] locking/rtmutex: don't drop the wait_lock twice |
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Since the futex rework, __rt_mutex_start_proxy_lock() does no longer acquire the wait_lock so it must not drop it. Otherwise the lock is not only unlocked twice but also the preemption counter is underflown.
Cc: rt-stable@vger.kernel.org Reported-by: Gusenleitner Klaus <gus@keba.com> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> --- kernel/locking/rtmutex.c | 1 - 1 file changed, 1 deletion(-)
diff --git a/kernel/locking/rtmutex.c b/kernel/locking/rtmutex.c index f03876322d4a..79f49d73e4d0 100644 --- a/kernel/locking/rtmutex.c +++ b/kernel/locking/rtmutex.c @@ -2281,7 +2281,6 @@ int __rt_mutex_start_proxy_lock(struct rt_mutex *lock, raw_spin_lock(&task->pi_lock); if (task->pi_blocked_on) { raw_spin_unlock(&task->pi_lock); - raw_spin_unlock_irq(&lock->wait_lock); return -EAGAIN; } task->pi_blocked_on = PI_REQUEUE_INPROGRESS; -- 2.14.1
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