xen, fbfront: fix connecting to backend

[ Upstream commit 9121b15b ]

Connecting to the backend isn't working reliably in xen-fbfront: in
case XenbusStateInitWait of the backend has been missed the backend
transition to XenbusStateConnected will trigger the connected state
only without doing the actions required when the backend has
connected.

Cc: stable@vger.kernel.org
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>

drivers/video/fbdev/xen-fbfront.c

@@ -644,7 +644,6 @@ static void xenfb_backend_changed(struct xenbus_device *dev,
 		break;
 
 	case XenbusStateInitWait:
-InitWait:
 		xenbus_switch_state(dev, XenbusStateConnected);
 		break;
 
@@ -655,7 +654,8 @@ static void xenfb_backend_changed(struct xenbus_device *dev,
 		 * get Connected twice here.
 		 */
 		if (dev->state != XenbusStateConnected)
-			goto InitWait; /* no InitWait seen yet, fudge it */
+			/* no InitWait seen yet, fudge it */
+			xenbus_switch_state(dev, XenbusStateConnected);
 
 		if (xenbus_scanf(XBT_NIL, info->xbdev->otherend,
 				 "request-update", "%d", &val) < 0)