evie/android_kernel_oneplus_msm8998
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[PATCH] __blk_rq_map_user() doesn't need to grab the queue_lock

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It was for driver private back_merge_fn hooks, but they don't exist
anymore.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jens Axboe 2006-12-19 08:34:17 +01:00
parent 1aa4f24fe9
commit 9c9381f942
1 changed files with 0 additions and 9 deletions

9
block/ll_rw_blk.c
View file

@ -2359,18 +2359,10 @@ static int __blk_rq_map_user(request_queue_t *q, struct request *rq,
*/ */
bio_get(bio); 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) if (!rq->bio)
blk_rq_bio_prep(q, rq, bio); blk_rq_bio_prep(q, rq, bio);
else if (!ll_back_merge_fn(q, rq, bio)) { else if (!ll_back_merge_fn(q, rq, bio)) {
ret = -EINVAL; ret = -EINVAL;
spin_unlock_irq(q->queue_lock);
goto unmap_bio; goto unmap_bio;
} else { } else {
rq->biotail->bi_next = bio; rq->biotail->bi_next = bio;
@ -2378,7 +2370,6 @@ static int __blk_rq_map_user(request_queue_t *q, struct request *rq,
rq->data_len += bio->bi_size; rq->data_len += bio->bi_size;
} }
spin_unlock_irq(q->queue_lock);
return bio->bi_size; return bio->bi_size;