[SCSI] scsi_dh: fix reference counting in scsi_dh_activate error path
Commit db422318cbca55168cf965f655471dbf8be82433 ([SCSI] scsi_dh:
propagate SCSI device deletion) introduced a regression where the device
reference is not dropped prior to scsi_dh_activate's early return from
the error path.
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@kernel.org # 2.6.38
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
diff --git a/drivers/scsi/device_handler/scsi_dh.c b/drivers/scsi/device_handler/scsi_dh.c
index 564e6ec..0119b81 100644
--- a/drivers/scsi/device_handler/scsi_dh.c
+++ b/drivers/scsi/device_handler/scsi_dh.c
@@ -394,12 +394,14 @@
unsigned long flags;
struct scsi_device *sdev;
struct scsi_device_handler *scsi_dh = NULL;
+ struct device *dev = NULL;
spin_lock_irqsave(q->queue_lock, flags);
sdev = q->queuedata;
if (sdev && sdev->scsi_dh_data)
scsi_dh = sdev->scsi_dh_data->scsi_dh;
- if (!scsi_dh || !get_device(&sdev->sdev_gendev) ||
+ dev = get_device(&sdev->sdev_gendev);
+ if (!scsi_dh || !dev ||
sdev->sdev_state == SDEV_CANCEL ||
sdev->sdev_state == SDEV_DEL)
err = SCSI_DH_NOSYS;
@@ -410,12 +412,13 @@
if (err) {
if (fn)
fn(data, err);
- return err;
+ goto out;
}
if (scsi_dh->activate)
err = scsi_dh->activate(sdev, fn, data);
- put_device(&sdev->sdev_gendev);
+out:
+ put_device(dev);
return err;
}
EXPORT_SYMBOL_GPL(scsi_dh_activate);