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scsi: return correct blkprep status code in case scsi_init_io() fails.

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commit e7661a8e5c upstream.

When instrumenting the SCSI layer to run into the
!blk_rq_nr_phys_segments(rq) case the following warning emitted from the
block layer:

blk_peek_request: bad return=-22

This happens because since commit fd3fc0b4d7 ("scsi: don't BUG_ON()
empty DMA transfers") we return the wrong error value from
scsi_prep_fn() back to the block layer.

[mkp: silenced checkpatch]

Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Fixes: fd3fc0b4d7 scsi: don't BUG_ON() empty DMA transfers
Cc: <stable@vger.kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
[iwamatsu: - backport for 4.4.y and 4.9.y
    - Use rq->nr_phys_segments instead of blk_rq_nr_phys_segments]
Signed-off-by: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johannes Thumshirn
2017-04-12 09:21:19 +02:00
committed by Chris
parent 1e63bed66a
commit ff3c2e0f93
1 changed files with 2 additions and 2 deletions
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4
drivers/scsi/scsi_lib.c
View File

@@ -1029,10 +1029,10 @@ int scsi_init_io(struct scsi_cmnd *cmd)
struct scsi_device *sdev = cmd->device;
struct request *rq = cmd->request;
bool is_mq = (rq->mq_ctx != NULL);
int error;
int error = BLKPREP_KILL;
if (WARN_ON_ONCE(!rq->nr_phys_segments))
return -EINVAL;
goto err_exit;
error = scsi_init_sgtable(rq, &cmd->sdb);
if (error)