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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: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@fb.com>
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9041583765
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fe052529e4
1 changed files with 5 additions and 1 deletions
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@ -1846,6 +1846,8 @@ static int scsi_mq_prep_fn(struct request *req)
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next_rq->special = bidi_sdb;
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}
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blk_mq_start_request(req);
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return scsi_setup_cmnd(sdev, req);
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}
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@ -1880,17 +1882,19 @@ static int scsi_queue_rq(struct blk_mq_hw_ctx *hctx, struct request *req,
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if (!scsi_host_queue_ready(q, shost, sdev))
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goto out_dec_target_busy;
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if (!(req->cmd_flags & REQ_DONTPREP)) {
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ret = prep_to_mq(scsi_mq_prep_fn(req));
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if (ret)
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goto out_dec_host_busy;
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req->cmd_flags |= REQ_DONTPREP;
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} else {
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blk_mq_start_request(req);
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}
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scsi_init_cmd_errh(cmd);
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cmd->scsi_done = scsi_mq_done;
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blk_mq_start_request(req);
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reason = scsi_dispatch_cmd(cmd);
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if (reason) {
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scsi_set_blocked(cmd, reason);
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