[PATCH 1/2] futex: Fix irq mismatch in exit_pi_state_list()

[Davidlohr Bueso <dave@stgolabs.net>]

The pi_mutex->wait_lock is irq safe and needs to enable local
interrupts upon unlocking, matching it's corresponding
raw_spin_lock_irq().

Fixes: c74aef2d06a9f (futex: Fix pi_state->owner serialization)
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
---
 kernel/futex.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/futex.c b/kernel/futex.c
index 475055715371..ded7af2ba87f 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -885,7 +885,7 @@ static void exit_pi_state_list(struct task_struct *curr)
 		 */
 		if (head->next != next) {
 			/* retain curr->pi_lock for the loop invariant */
-			raw_spin_unlock(&pi_state->pi_mutex.wait_lock);
+			raw_spin_unlock_irq(&pi_state->pi_mutex.wait_lock);
 			spin_unlock(&hb->lock);
 			put_pi_state(pi_state);
 			continue;
-- 
2.26.2