diff options
| author | Hannes Reinecke <hare@suse.de> | 2017-02-17 11:02:45 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-03-12 08:37:26 +0300 |
| commit | 33950b56d2c20d10e85a0ab339e5368e8d029a2b (patch) | |
| tree | 13d3011e452a4e5cdaeb749a9109352937ce38d0 /drivers/scsi/scsi_lib.c | |
| parent | 2dc9a859eb8918ff86efdd0f2a570bcb3d9d6973 (diff) | |
| download | linux-33950b56d2c20d10e85a0ab339e5368e8d029a2b.tar.xz | |
scsi: use 'scsi_device_from_queue()' for scsi_dh
commit 857de6e00778738dc3d61f75acbac35bdc48e533 upstream.
The device handler needs to check if a given queue belongs to a scsi
device; only then does it make sense to attach a device handler.
[mkp: dropped flags]
Signed-off-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/scsi/scsi_lib.c')
| -rw-r--r-- | drivers/scsi/scsi_lib.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index 8558e3886960..887045ae5d10 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -2215,6 +2215,29 @@ void scsi_mq_destroy_tags(struct Scsi_Host *shost) blk_mq_free_tag_set(&shost->tag_set); } +/** + * scsi_device_from_queue - return sdev associated with a request_queue + * @q: The request queue to return the sdev from + * + * Return the sdev associated with a request queue or NULL if the + * request_queue does not reference a SCSI device. + */ +struct scsi_device *scsi_device_from_queue(struct request_queue *q) +{ + struct scsi_device *sdev = NULL; + + if (q->mq_ops) { + if (q->mq_ops == &scsi_mq_ops) + sdev = q->queuedata; + } else if (q->request_fn == scsi_request_fn) + sdev = q->queuedata; + if (!sdev || !get_device(&sdev->sdev_gendev)) + sdev = NULL; + + return sdev; +} +EXPORT_SYMBOL_GPL(scsi_device_from_queue); + /* * Function: scsi_block_requests() * |