Btrfs: Check kthread_should_stop() before schedule() in worker_loop
In worker_loop(), the func should check whether it has been requested to stop
before it decides to schedule out.
Otherwise if the stop request(also the last wake_up()) sent by
btrfs_stop_workers() happens when worker_loop() running after the "while"
judgement and before schedule(), woker_loop() will schedule away and never be
woken up, which will also cause btrfs_stop_workers() wait forever.
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/async-thread.c b/fs/btrfs/async-thread.c
index e1e497154..4229450 100644
--- a/fs/btrfs/async-thread.c
+++ b/fs/btrfs/async-thread.c
@@ -171,7 +171,8 @@
} else {
set_current_state(TASK_INTERRUPTIBLE);
spin_unlock_irq(&worker->lock);
- schedule();
+ if (!kthread_should_stop())
+ schedule();
__set_current_state(TASK_RUNNING);
}
} while (!kthread_should_stop());