scsi: ibmvscsi: add vscsi hosts to global list_head

Add each vscsi host adatper to a new global list_head named
ibmvscsi_head. There is no functional change. This is meant primarily as
a convience for locating adapters from within the debugger or crash
utility.

[mkp: fixed typo]
Signed-off-by: Tyrel Datwyler <tyreld@linux.vnet.ibm.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/ibmvscsi/ibmvscsi.c

@@ -95,6 +95,7 @@ static int fast_fail = 1;
 static int client_reserve = 1;
 static char partition_name[97] = "UNKNOWN";
 static unsigned int partition_number = -1;
+static LIST_HEAD(ibmvscsi_head);
 
 static struct scsi_transport_template *ibmvscsi_transport_template;
 
@@ -2270,6 +2271,7 @@ static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id)
 	}
 
 	dev_set_drvdata(&vdev->dev, hostdata);
+	list_add_tail(&hostdata->host_list, &ibmvscsi_head);
 	return 0;
 
       add_srp_port_failed:
@@ -2291,6 +2293,7 @@ static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id)
 static int ibmvscsi_remove(struct vio_dev *vdev)
 {
 	struct ibmvscsi_host_data *hostdata = dev_get_drvdata(&vdev->dev);
+	list_del(&hostdata->host_list);
 	unmap_persist_bufs(hostdata);
 	release_event_pool(&hostdata->pool, hostdata);
 	ibmvscsi_release_crq_queue(&hostdata->queue, hostdata,

drivers/scsi/ibmvscsi/ibmvscsi.h

@@ -90,6 +90,7 @@ struct event_pool {
 
 /* all driver data associated with a host adapter */
 struct ibmvscsi_host_data {
+	struct list_head host_list;
 	atomic_t request_limit;
 	int client_migrated;
 	int reset_crq;