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 <h...@lst.de>
---
drivers/scsi/scsi_lib.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index dc01ab2..56cc4b4 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -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);
--
1.9.1
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