md/plug: optionally use plugger to unplug an array during resync/recovery.

If an array doesn't have a 'queue' then md_do_sync cannot
unplug it.
In that case it will have a 'plugger', so make that available
to the mddev, and use it to unplug the array if needed.

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

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 84bb9aec2211..0a8173e650bb 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -5189,6 +5189,7 @@ static int run(mddev_t *mddev)
         md_set_array_sectors(mddev, raid5_size(mddev, 0, 0));
 
         plugger_init(&conf->plug, raid5_unplug);
+        mddev->plug = &conf->plug;
         if (mddev->queue) {
                 /* read-ahead size must cover two whole stripes, which
                  * is 2 * (datadisks) * chunksize where 'n' is the