[PATCH] __blk_rq_map_user() doesn't need to grab the queue_lock
It was for driver private back_merge_fn hooks, but they don't exist
anymore.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c
index 4337979..5d472e4 100644
--- a/block/ll_rw_blk.c
+++ b/block/ll_rw_blk.c
@@ -2359,18 +2359,10 @@
*/
bio_get(bio);
- /*
- * for most (all? don't know of any) queues we could
- * skip grabbing the queue lock here. only drivers with
- * funky private ->back_merge_fn() function could be
- * problematic.
- */
- spin_lock_irq(q->queue_lock);
if (!rq->bio)
blk_rq_bio_prep(q, rq, bio);
else if (!ll_back_merge_fn(q, rq, bio)) {
ret = -EINVAL;
- spin_unlock_irq(q->queue_lock);
goto unmap_bio;
} else {
rq->biotail->bi_next = bio;
@@ -2378,7 +2370,6 @@
rq->data_len += bio->bi_size;
}
- spin_unlock_irq(q->queue_lock);
return bio->bi_size;