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scsi-mq: fix requests that use a separate CDB buffer

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This patch fixes code such as the following with scsi-mq enabled:

    rq = blk_get_request(...);
    blk_rq_set_block_pc(rq);

    rq->cmd = my_cmd_buffer; /* separate CDB buffer */

    blk_execute_rq_nowait(...);

Code like this appears in e.g. sg_start_req() in drivers/scsi/sg.c (for
large CDBs only).  Without this patch, scsi_mq_prep_fn() will set
rq->cmd back to rq->__cmd, causing the wrong CDB to be sent to the device.

Signed-off-by: Tony Battersby <tonyb@cybernetics.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Tony Battersby 2014-08-22 15:53:39 -04:00 committed by Jens Axboe
parent a57821cac6
commit 6f4a16266f
3 changed files with 2 additions and 2 deletions
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1
block/blk-core.c
View File

@ -1252,7 +1252,6 @@ void blk_rq_set_block_pc(struct request *rq)
rq->__sector = (sector_t) -1;
rq->bio = rq->biotail = NULL;
memset(rq->__cmd, 0, sizeof(rq->__cmd));
rq->cmd = rq->__cmd;
}
EXPORT_SYMBOL(blk_rq_set_block_pc);

2
block/blk-mq.c
View File

@ -176,6 +176,8 @@ static void blk_mq_rq_ctx_init(struct request_queue *q, struct blk_mq_ctx *ctx,
/* tag was already set */
rq->errors = 0;
rq->cmd = rq->__cmd;
rq->extra_len = 0;
rq->sense_len = 0;
rq->resid_len = 0;

1
drivers/scsi/scsi_lib.c
View File

@ -1808,7 +1808,6 @@ static int scsi_mq_prep_fn(struct request *req)
cmd->tag = req->tag;
req->cmd = req->__cmd;
cmd->cmnd = req->cmd;
cmd->prot_op = SCSI_PROT_NORMAL;