[SCSI] scsi_dh_rdac: Adding the match function for rdac device handler

This patch introduces the match function for rdac device handler. Without
this, sometimes handler attach fails during the device_add. Included check for
TPGS bit before proceeding further. The match function was introduced by
commit 6c3633d08acf514e2e89aa95d2346ce9d64d719a

Signed-off-by: Babu Moger <babu.moger@netapp.com>
Acked-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/drivers/scsi/device_handler/scsi_dh_rdac.c b/drivers/scsi/device_handler/scsi_dh_rdac.c
index 1d3127920063..841ebf4a6788 100644
--- a/drivers/scsi/device_handler/scsi_dh_rdac.c
+++ b/drivers/scsi/device_handler/scsi_dh_rdac.c
@@ -820,6 +820,24 @@ static const struct scsi_dh_devlist rdac_dev_list[] = {
         {NULL, NULL},
 };
 
+static bool rdac_match(struct scsi_device *sdev)
+{
+        int i;
+
+        if (scsi_device_tpgs(sdev))
+                return false;
+
+        for (i = 0; rdac_dev_list[i].vendor; i++) {
+                if (!strncmp(sdev->vendor, rdac_dev_list[i].vendor,
+                        strlen(rdac_dev_list[i].vendor)) &&
+                    !strncmp(sdev->model, rdac_dev_list[i].model,
+                        strlen(rdac_dev_list[i].model))) {
+                        return true;
+                }
+        }
+        return false;
+}
+
 static int rdac_bus_attach(struct scsi_device *sdev);
 static void rdac_bus_detach(struct scsi_device *sdev);
 
@@ -832,6 +850,7 @@ static struct scsi_device_handler rdac_dh = {
         .attach = rdac_bus_attach,
         .detach = rdac_bus_detach,
         .activate = rdac_activate,
+        .match = rdac_match,
 };
 
 static int rdac_bus_attach(struct scsi_device *sdev)