[PATCH RT] posix-timers: Unlock expiry lock in the early return

[Sebastian Andrzej Siewior]

Patch ("posix-timers: Add expiry lock") acquired a lock in
run_posix_cpu_timers() but didn't drop the lock in the early return.

Unlock the lock in the early return path.

Reported-by: kbuild test robot <l...@intel.com>
Reported-by: Dan Carpenter <dan.carpen...@oracle.com>
Signed-off-by: Sebastian Andrzej Siewior <bige...@linutronix.de>
---
 kernel/time/posix-cpu-timers.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/time/posix-cpu-timers.c b/kernel/time/posix-cpu-timers.c
index 20cd92a8b9785..a045813c37021 100644
--- a/kernel/time/posix-cpu-timers.c
+++ b/kernel/time/posix-cpu-timers.c
@@ -1167,8 +1167,10 @@ static void __run_posix_cpu_timers(struct task_struct 
*tsk)
        expiry_lock = this_cpu_ptr(&cpu_timer_expiry_lock);
        spin_lock(expiry_lock);
 
-       if (!lock_task_sighand(tsk, &flags))
+       if (!lock_task_sighand(tsk, &flags)) {
+               spin_unlock(expiry_lock);
                return;
+       }
        /*
         * Here we take off tsk->signal->cpu_timers[N] and
         * tsk->cpu_timers[N] all the timers that are firing, and
-- 
2.23.0