diff mbox series

[GIT,PULL] locking fix

Message ID Y+dXxGNISTLdmh/U@gmail.com
State New
Headers
Series [GIT,PULL] locking fix |

Commit Message

Ingo Molnar Feb. 11, 2023, 8:54 a.m. UTC 
  Linus,

Please pull the latest locking/urgent git tree from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git locking-urgent-2023-02-11

   # HEAD: db370a8b9f67ae5f17e3d5482493294467784504 rtmutex: Ensure that the top waiter is always woken up

Fix an rtmutex missed-wakeup bug.

 Thanks,

	Ingo

------------------>
Wander Lairson Costa (1):
      rtmutex: Ensure that the top waiter is always woken up


 kernel/locking/rtmutex.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

Comments

pr-tracker-bot@kernel.org Feb. 11, 2023, 7:24 p.m. UTC | #1 
The pull request you sent on Sat, 11 Feb 2023 09:54:28 +0100:

> git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git locking-urgent-2023-02-11

has been merged into torvalds/linux.git:
https://git.kernel.org/torvalds/c/338c84730406c30185d54b565d670e7e7c96967b

Thank you!
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Patch

diff --git a/kernel/locking/rtmutex.c b/kernel/locking/rtmutex.c
index 010cf4e6d0b8..728f434de2bb 100644
--- a/kernel/locking/rtmutex.c
+++ b/kernel/locking/rtmutex.c
@@ -901,8 +901,9 @@  static int __sched rt_mutex_adjust_prio_chain(struct task_struct *task,
 		 * then we need to wake the new top waiter up to try
 		 * to get the lock.
 		 */
-		if (prerequeue_top_waiter != rt_mutex_top_waiter(lock))
-			wake_up_state(waiter->task, waiter->wake_state);
+		top_waiter = rt_mutex_top_waiter(lock);
+		if (prerequeue_top_waiter != top_waiter)
+			wake_up_state(top_waiter->task, top_waiter->wake_state);
 		raw_spin_unlock_irq(&lock->wait_lock);
 		return 0;
 	}