Commit fe052529 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Jens Axboe
Browse files

scsi: move blk_mq_start_request call earlier 



Some ATA drivers need the dma drain size workaround, and thus need to
call blk_mq_start_request before the S/G mapping.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent 90415837

drivers/scsi/scsi_lib.c

+5 −1
Original line number Diff line number Diff line
@@ -1846,6 +1846,8 @@ static int scsi_mq_prep_fn(struct request *req) 
		next_rq->special = bidi_sdb;

	}



	blk_mq_start_request(req);



	return scsi_setup_cmnd(sdev, req);

}
@@ -1880,17 +1882,19 @@ static int scsi_queue_rq(struct blk_mq_hw_ctx *hctx, struct request *req, 
	if (!scsi_host_queue_ready(q, shost, sdev))

		goto out_dec_target_busy;





	if (!(req->cmd_flags & REQ_DONTPREP)) {

		ret = prep_to_mq(scsi_mq_prep_fn(req));

		if (ret)

			goto out_dec_host_busy;

		req->cmd_flags |= REQ_DONTPREP;

	} else {

		blk_mq_start_request(req);

	}



	scsi_init_cmd_errh(cmd);

	cmd->scsi_done = scsi_mq_done;



	blk_mq_start_request(req);

	reason = scsi_dispatch_cmd(cmd);

	if (reason) {

		scsi_set_blocked(cmd, reason);