[SCSI] scsi_dh: Check for sdev state in store_dh_state()

Avoid attaching a hardware handler to a device which is
already scheduled for deletion.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/scsi/device_handler/scsi_dh.c b/drivers/scsi/device_handler/scsi_dh.c
index 3ac71cf6b7f..7c05fd9dccf 100644
--- a/drivers/scsi/device_handler/scsi_dh.c
+++ b/drivers/scsi/device_handler/scsi_dh.c
@@ -190,6 +190,10 @@ store_dh_state(struct device *dev, struct device_attribute *attr,
         struct scsi_device_handler *scsi_dh;
         int err = -EINVAL;
 
+        if (sdev->sdev_state == SDEV_CANCEL ||
+            sdev->sdev_state == SDEV_DEL)
+                return -ENODEV;
+
         if (!sdev->scsi_dh_data) {
                 /*
                  * Attach to a device handler