diff options
| -rw-r--r-- | drivers/block/virtio_blk.c | 22 |
1 files changed, 11 insertions, 11 deletions
diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c index cc88b29c6393..64723953e1c9 100644 --- a/drivers/block/virtio_blk.c +++ b/drivers/block/virtio_blk.c @@ -62,7 +62,6 @@ struct virtblk_req struct virtio_blk *vblk; int flags; u8 status; - int nents; struct scatterlist sg[]; }; @@ -104,7 +103,7 @@ static inline struct virtblk_req *virtblk_alloc_req(struct virtio_blk *vblk, static int __virtblk_add_req(struct virtqueue *vq, struct virtblk_req *vbr, struct scatterlist *data_sg, - unsigned data_nents) + bool have_data) { struct scatterlist hdr, status, cmd, sense, inhdr, *sgs[6]; unsigned int num_out = 0, num_in = 0; @@ -124,7 +123,7 @@ static int __virtblk_add_req(struct virtqueue *vq, sgs[num_out++] = &cmd; } - if (data_nents) { + if (have_data) { if (vbr->out_hdr.type & VIRTIO_BLK_T_OUT) sgs[num_out++] = data_sg; else @@ -144,7 +143,7 @@ static int __virtblk_add_req(struct virtqueue *vq, return virtqueue_add_sgs(vq, sgs, num_out, num_in, vbr, GFP_ATOMIC); } -static void virtblk_add_req(struct virtblk_req *vbr) +static void virtblk_add_req(struct virtblk_req *vbr, bool have_data) { struct virtio_blk *vblk = vbr->vblk; DEFINE_WAIT(wait); @@ -152,7 +151,7 @@ static void virtblk_add_req(struct virtblk_req *vbr) spin_lock_irq(vblk->disk->queue->queue_lock); while (unlikely((ret = __virtblk_add_req(vblk->vq, vbr, vbr->sg, - vbr->nents)) < 0)) { + have_data)) < 0)) { prepare_to_wait_exclusive(&vblk->queue_wait, &wait, TASK_UNINTERRUPTIBLE); @@ -173,30 +172,31 @@ static void virtblk_bio_send_flush(struct virtblk_req *vbr) vbr->out_hdr.type = VIRTIO_BLK_T_FLUSH; vbr->out_hdr.sector = 0; vbr->out_hdr.ioprio = 0; - vbr->nents = 0; - virtblk_add_req(vbr); + virtblk_add_req(vbr, false); } static void virtblk_bio_send_data(struct virtblk_req *vbr) { struct virtio_blk *vblk = vbr->vblk; struct bio *bio = vbr->bio; + bool have_data; vbr->flags &= ~VBLK_IS_FLUSH; vbr->out_hdr.type = 0; vbr->out_hdr.sector = bio->bi_sector; vbr->out_hdr.ioprio = bio_prio(bio); - vbr->nents = blk_bio_map_sg(vblk->disk->queue, bio, vbr->sg); - if (vbr->nents) { + if (blk_bio_map_sg(vblk->disk->queue, bio, vbr->sg)) { + have_data = true; if (bio->bi_rw & REQ_WRITE) vbr->out_hdr.type |= VIRTIO_BLK_T_OUT; else vbr->out_hdr.type |= VIRTIO_BLK_T_IN; - } + } else + have_data = false; - virtblk_add_req(vbr); + virtblk_add_req(vbr, have_data); } static void virtblk_bio_send_data_work(struct work_struct *work) |
