X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=kernel%2Frtmutex.c;h=17d28ce20300dec918be53d4aa136dabb590fc47;hb=0806ca2ab3ef7d7a1bd41a980f661a13ba11acb5;hp=180978cb2f7524b180863967be0391d32f47783d;hpb=902b236c087bf021c94cc21a2b09d928c4156c2b;p=linux-2.6

diff --git a/kernel/rtmutex.c b/kernel/rtmutex.c
index 180978cb2f..17d28ce203 100644
--- a/kernel/rtmutex.c
+++ b/kernel/rtmutex.c
@@ -212,6 +212,19 @@ static int rt_mutex_adjust_prio_chain(struct task_struct *task,
 	if (!waiter || !waiter->task)
 		goto out_unlock_pi;
 
+	/*
+	 * Check the orig_waiter state. After we dropped the locks,
+	 * the previous owner of the lock might have released the lock
+	 * and made us the pending owner:
+	 */
+	if (orig_waiter && !orig_waiter->task)
+		goto out_unlock_pi;
+
+	/*
+	 * Drop out, when the task has no waiters. Note,
+	 * top_waiter can be NULL, when we are in the deboosting
+	 * mode!
+	 */
 	if (top_waiter && (!task_has_pi_waiters(task) ||
 			   top_waiter != task_top_pi_waiter(task)))
 		goto out_unlock_pi;
@@ -659,9 +672,16 @@ rt_mutex_slowlock(struct rt_mutex *lock, int state,
 			 * all over without going into schedule to try
 			 * to get the lock now:
 			 */
-			if (unlikely(!waiter.task))
+			if (unlikely(!waiter.task)) {
+				/*
+				 * Reset the return value. We might
+				 * have returned with -EDEADLK and the
+				 * owner released the lock while we
+				 * were walking the pi chain.
+				 */
+				ret = 0;
 				continue;
-
+			}
 			if (unlikely(ret))
 				break;
 		}