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| author | Bart Van Assche <bart.vanassche@wdc.com> | 2017-08-31 01:58:42 +0200 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2017-09-01 05:09:49 +0200 |
| commit | a45a1f3614182267803baadba657b59e2ddc0545 (patch) | |
| tree | 0037ff3d93bb03e8b5578844447668afd2f0c4d6 | |
| parent | scsi: Show .retries and .jiffies_at_alloc in debugfs (diff) | |
| download | linux-a45a1f3614182267803baadba657b59e2ddc0545.tar.xz linux-a45a1f3614182267803baadba657b59e2ddc0545.zip | |
scsi: scsi-mq: Always unprepare before requeuing a request
One of the two scsi-mq functions that requeue a request unprepares a
request before requeueing (scsi_io_completion()) but the other function
not (__scsi_queue_insert()). Make sure that a request is unprepared
before requeuing it.
Fixes: commit d285203cf647 ("scsi: add support for a blk-mq based I/O path.")
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.com>
Cc: Damien Le Moal <damien.lemoal@wdc.com>
Cc: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
| -rw-r--r-- | drivers/scsi/scsi_lib.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index 6085377643ae..9cf6a80fe297 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -44,6 +44,8 @@ static struct kmem_cache *scsi_sense_cache; static struct kmem_cache *scsi_sense_isadma_cache; static DEFINE_MUTEX(scsi_sense_cache_mutex); +static void scsi_mq_uninit_cmd(struct scsi_cmnd *cmd); + static inline struct kmem_cache * scsi_select_sense_cache(bool unchecked_isa_dma) { @@ -140,6 +142,12 @@ static void scsi_mq_requeue_cmd(struct scsi_cmnd *cmd) { struct scsi_device *sdev = cmd->device; + if (cmd->request->rq_flags & RQF_DONTPREP) { + cmd->request->rq_flags &= ~RQF_DONTPREP; + scsi_mq_uninit_cmd(cmd); + } else { + WARN_ON_ONCE(true); + } blk_mq_requeue_request(cmd->request, true); put_device(&sdev->sdev_gendev); } @@ -982,8 +990,6 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes) * A new command will be prepared and issued. */ if (q->mq_ops) { - cmd->request->rq_flags &= ~RQF_DONTPREP; - scsi_mq_uninit_cmd(cmd); scsi_mq_requeue_cmd(cmd); } else { scsi_release_buffers(cmd); |