diff options
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() * |