md/raid10: don't modify 'nr_waitng' in wait_barrier() for the case nowait

For the case nowait in wait_barrier(), there is no point to increase
nr_waiting and then decrease it.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Acked-by: Guoqing Jiang <guoqing.jiang@linux.dev>
Signed-off-by: Song Liu <song@kernel.org>

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 310a613..834a342 100644 (file)
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -990,17 +990,17 @@ static bool wait_barrier(struct r10conf *conf, bool nowait)
 
        spin_lock_irq(&conf->resync_lock);
        if (conf->barrier) {
-               conf->nr_waiting++;
                /* Return false when nowait flag is set */
                if (nowait) {
                        ret = false;
                } else {
+                       conf->nr_waiting++;
                        raid10_log(conf->mddev, "wait barrier");
                        wait_event_lock_irq(conf->wait_barrier,
                                            stop_waiting_barrier(conf),
                                            conf->resync_lock);
+                       conf->nr_waiting--;
                }
-               conf->nr_waiting--;
                if (!conf->nr_waiting)
                        wake_up(&conf->wait_barrier);
        }