[PATCH] scsi_dh: only attach to SCSI devices

[Hannes Reinecke]

Any device might be setting a queuedata structure, so we need to
check if the queuedata really belongs to a SCSI device before
proceeding.

Signed-off-by: Hannes Reinecke <h...@suse.com>
---
 drivers/scsi/scsi_dh.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/scsi_dh.c b/drivers/scsi/scsi_dh.c
index b8d3b97..da104ed 100644
--- a/drivers/scsi/scsi_dh.c
+++ b/drivers/scsi/scsi_dh.c
@@ -226,7 +226,9 @@ static struct scsi_device *get_sdev_from_queue(struct 
request_queue *q)
 
        spin_lock_irqsave(q->queue_lock, flags);
        sdev = q->queuedata;
-       if (!sdev || !get_device(&sdev->sdev_gendev))
+       if (!sdev ||
+           !scsi_is_sdev_device(&sdev->sdev_gendev) ||
+           !get_device(&sdev->sdev_gendev))
                sdev = NULL;
        spin_unlock_irqrestore(q->queue_lock, flags);
 
-- 
1.8.5.6