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..9820f1f 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 && sdev->scsi_dh_data) {
+ scsi_dh = sdev->scsi_dh_data->scsi_dh;
+ }
if (!scsi_dh)
return -EINVAL;
--
1.6.0.2
--
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