[PATCH 1/2] scsi_dh: Allow NULL hardware handler name in scsi_dh_attach()

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This patch allows to pass in a NULL hardware handler to
scsi_dh_attach(), causing the reference count of the existing
hardware handler to be increased.
An error will be returned if no hardware handler is attached.

Signed-off-by: Hannes Reinecke <hare@xxxxxxx>
---
 drivers/scsi/device_handler/scsi_dh.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/device_handler/scsi_dh.c b/drivers/scsi/device_handler/scsi_dh.c
index 48e46f5..77fa67e 100644
--- a/drivers/scsi/device_handler/scsi_dh.c
+++ b/drivers/scsi/device_handler/scsi_dh.c
@@ -475,10 +475,14 @@ int scsi_dh_attach(struct request_queue *q, const char *name)
 {
 	unsigned long flags;
 	struct scsi_device *sdev;
-	struct scsi_device_handler *scsi_dh;
+	struct scsi_device_handler *scsi_dh = NULL;
 	int err = 0;
 
-	scsi_dh = get_device_handler(name);
+	if (name) {
+		scsi_dh = get_device_handler(name);
+	} else if (sdev->scsi_dh_data) {
+		scsi_dh = sdev->scsi_dh_data->scsi_dh;
+	}
 	if (!scsi_dh)
 		return -EINVAL;
 
-- 
1.7.7

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