[RT,09/16] Revert "futex: Ensure lock/unlock symetry versus pi_lock and hash bucket lock"
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Message ID 20190719214957.451089624@goodmis.org
State New
Headers show
Series
  • Linux 4.19.59-rt24-rc1
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Commit Message

Steven Rostedt July 19, 2019, 9:49 p.m. UTC
4.19.59-rt24-rc1 stable review patch.
If anyone has any objections, please let me know.

------------------

From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

[ Upstream commit 6a773b70cf105b46298ed3b44e77c102ce31d9ec ]

Drop the RT fixup, the futex code will be changed to avoid the need for
the workaround.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
 kernel/futex.c | 2 --
 1 file changed, 2 deletions(-)

Patch
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diff --git a/kernel/futex.c b/kernel/futex.c
index fe90164aa6ec..a58af833bb77 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -918,9 +918,7 @@  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(&curr->pi_lock);
 			spin_unlock(&hb->lock);
-			raw_spin_lock_irq(&curr->pi_lock);
 			put_pi_state(pi_state);
 			continue;
 		}