[PATCH 3/3] xfs_scrub: remove unnecessary wakeup wait in scan_fs_tree

["Darrick J. Wong" <darrick.wong@oracle.com>]

From: Darrick J. Wong <darrick.wong@oracle.com>

We don't need to wait on the condition variable if directory tree
scanning has already finished by the time we've finished queueing all
the directory work items.  This is easy to trigger when the workqueue is
single-threaded, but in theory it could happen any time.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
---
 scrub/vfs.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)


diff --git a/scrub/vfs.c b/scrub/vfs.c
index f8bc98c0..1a1482dd 100644
--- a/scrub/vfs.c
+++ b/scrub/vfs.c
@@ -246,7 +246,8 @@ scan_fs_tree(
 	 * about to tear everything down.
 	 */
 	pthread_mutex_lock(&sft.lock);
-	pthread_cond_wait(&sft.wakeup, &sft.lock);
+	if (sft.nr_dirs)
+		pthread_cond_wait(&sft.wakeup, &sft.lock);
 	assert(sft.nr_dirs == 0);
 	pthread_mutex_unlock(&sft.lock);