md: remove handling of flush_pending in md_submit_flush_data

None of the functions called between setting flush_pending to 1, and
atomic_dec_and_test can change flush_pending, or will anything
running in any other thread (as ->flush_bio is not NULL).  So the
atomic_dec_and_test will always succeed.
So remove the atomic_sec and the atomic_dec_and_test.

Signed-off-by: NeilBrown <neilb@suse.de>

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 84c46a1..83b6cb3 100644 (file)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -404,8 +404,6 @@ static void md_submit_flush_data(struct work_struct *ws)
        mddev_t *mddev = container_of(ws, mddev_t, flush_work);
        struct bio *bio = mddev->flush_bio;
 
-       atomic_set(&mddev->flush_pending, 1);
-
        if (bio->bi_size == 0)
                /* an empty barrier - all done */
                bio_endio(bio, 0);
@@ -414,10 +412,9 @@ static void md_submit_flush_data(struct work_struct *ws)
                if (mddev->pers->make_request(mddev, bio))
                        generic_make_request(bio);
        }
-       if (atomic_dec_and_test(&mddev->flush_pending)) {
-               mddev->flush_bio = NULL;
-               wake_up(&mddev->sb_wait);
-       }
+
+       mddev->flush_bio = NULL;
+       wake_up(&mddev->sb_wait);
 }
 
 void md_flush_request(mddev_t *mddev, struct bio *bio)