md/raid10: wait up frozen array in handle_write_completed

Since nr_queued is changed, we need to call wake_up here
if the array is already frozen and waiting for condition
"nr_pending == nr_queued + extra" to be true.

And commit 824e47daddbf ("RAID1: avoid unnecessary spin
locks in I/O barrier code") which has already added the
wake_up for raid1.

Signed-off-by: Guoqing Jiang <gqjiang@suse.com>
Reviewed-by: NeilBrown <neilb@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 4167091..acb3f46 100644 (file)
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -2704,6 +2704,11 @@ static void handle_write_completed(struct r10conf *conf, struct r10bio *r10_bio)
                        list_add(&r10_bio->retry_list, &conf->bio_end_io_list);
                        conf->nr_queued++;
                        spin_unlock_irq(&conf->device_lock);
+                       /*
+                        * In case freeze_array() is waiting for condition
+                        * nr_pending == nr_queued + extra to be true.
+                        */
+                       wake_up(&conf->wait_barrier);
                        md_wakeup_thread(conf->mddev->thread);
                } else {
                        if (test_bit(R10BIO_WriteError,