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xen, fbfront: fix connecting to backend 

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>
zero-colors
Juergen Gross 2017-04-07 17:28:23 +02:00 committed by Bartlomiej Zolnierkiewicz
parent cfc5b2b551
commit 9121b15b56
1 changed files with 2 additions and 2 deletions
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4
drivers/video/fbdev/xen-fbfront.c
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@ -643,7 +643,6 @@ static void xenfb_backend_changed(struct xenbus_device *dev,
break;
case XenbusStateInitWait:
InitWait:
xenbus_switch_state(dev, XenbusStateConnected);
break;
@ -654,7 +653,8 @@ 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_read_unsigned(info->xbdev->otherend,
"request-update", 0))