Patch "xen, fbfront: fix connecting to backend" has been added to the 4.9-stable tree

This is a note to let you know that I've just added the patch titled

xen, fbfront: fix connecting to backend

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
xen-fbfront-fix-connecting-to-backend.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Juergen Gross <[email protected]>
Date: Fri, 7 Apr 2017 17:28:23 +0200
Subject: xen, fbfront: fix connecting to backend

From: Juergen Gross <[email protected]>

commit 9121b15b5628b38b4695282dc18c553440e0f79b upstream.

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.

---
 drivers/video/fbdev/xen-fbfront.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

@@ -644,7 +644,6 @@ static void xenfb_backend_changed(struct
 		break;
 
 	case XenbusStateInitWait:
-InitWait:
 		xenbus_switch_state(dev, XenbusStateConnected);
 		break;
 

@@ -655,7 +654,8 @@ InitWait:
 		 * 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)

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/xen-fbfront-fix-connecting-to-backend.patch