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/linear.c b/drivers/md/linear.c
index 56a11f6c127b..3dac1cfb8189 100644
--- a/drivers/md/linear.c
+++ b/drivers/md/linear.c
@@ -87,8 +87,7 @@ static void linear_unplug(struct request_queue *q)
 
         for (i=0; i < mddev->raid_disks; i++) {
                 struct request_queue *r_queue = bdev_get_queue(conf->disks[i].rdev->bdev);
-                if (r_queue->unplug_fn)
-                        r_queue->unplug_fn(r_queue);
+                blk_unplug(r_queue);
         }
 }