tcm_vhost: Add vhost_scsi_send_bad_target() helper

Share the send bad target code with other use cases.
Signed-off-by: Asias He <asias@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

drivers/vhost/tcm_vhost.c

@@ -578,6 +578,23 @@ static void tcm_vhost_submission_work(struct work_struct *work)
 	}
 }
 
+static void vhost_scsi_send_bad_target(struct vhost_scsi *vs,
+	struct vhost_virtqueue *vq, int head, unsigned out)
+{
+	struct virtio_scsi_cmd_resp __user *resp;
+	struct virtio_scsi_cmd_resp rsp;
+	int ret;
+
+	memset(&rsp, 0, sizeof(rsp));
+	rsp.response = VIRTIO_SCSI_S_BAD_TARGET;
+	resp = vq->iov[out].iov_base;
+	ret = __copy_to_user(resp, &rsp, sizeof(rsp));
+	if (!ret)
+		vhost_add_used_and_signal(&vs->dev, vq, head, 0);
+	else
+		pr_err("Faulted on virtio_scsi_cmd_resp\n");
+}
+
 static void vhost_scsi_handle_vq(struct vhost_scsi *vs,
 	struct vhost_virtqueue *vq)
 {
@@ -673,19 +690,7 @@ static void vhost_scsi_handle_vq(struct vhost_scsi *vs,
 
 		/* Target does not exist, fail the request */
 		if (unlikely(!tv_tpg)) {
-			struct virtio_scsi_cmd_resp __user *resp;
-			struct virtio_scsi_cmd_resp rsp;
-
-			memset(&rsp, 0, sizeof(rsp));
-			rsp.response = VIRTIO_SCSI_S_BAD_TARGET;
-			resp = vq->iov[out].iov_base;
-			ret = __copy_to_user(resp, &rsp, sizeof(rsp));
-			if (!ret)
-				vhost_add_used_and_signal(&vs->dev,
-							  vq, head, 0);
-			else
-				pr_err("Faulted on virtio_scsi_cmd_resp\n");
-
+			vhost_scsi_send_bad_target(vs, vq, head, out);
 			continue;
 		}