Add UNPLUG traces to all appropriate places

Added blk_unplug interface, allowing all invocations of unplugs to result
in a generated blktrace UNPLUG.

Signed-off-by: Alan D. Brunelle <Alan.Brunelle@hp.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 1 insertions, 2 deletions

diff --git a/drivers/md/multipath.c b/drivers/md/multipath.c
index b35731cceac6..eb631ebed686 100644
--- a/drivers/md/multipath.c
+++ b/drivers/md/multipath.c
@@ -125,8 +125,7 @@ static void unplug_slaves(mddev_t *mddev)
                         atomic_inc(&rdev->nr_pending);
                         rcu_read_unlock();
 
-                        if (r_queue->unplug_fn)
-                                r_queue->unplug_fn(r_queue);
+                        blk_unplug(r_queue);
 
                         rdev_dec_pending(rdev, mddev);
                         rcu_read_lock();