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xen, fbfront: fix connecting to backend

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commit 9121b15b56 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.

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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Juergen Gross 2017-04-07 17:28:23 +02:00 committed by Greg Kroah-Hartman
parent 92f8aa7bb8
commit e485875dff
1 changed files with 2 additions and 2 deletions
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4
drivers/video/fbdev/xen-fbfront.c
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@ -644,7 +644,6 @@ static void xenfb_backend_changed(struct xenbus_device *dev,
break; break;
case XenbusStateInitWait: case XenbusStateInitWait:
InitWait:
xenbus_switch_state(dev, XenbusStateConnected); xenbus_switch_state(dev, XenbusStateConnected);
break; break;
@ -655,7 +654,8 @@ InitWait:
* get Connected twice here. * get Connected twice here.
*/ */
if (dev->state != XenbusStateConnected) 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, if (xenbus_scanf(XBT_NIL, info->xbdev->otherend,
"request-update", "%d", &val) < 0) "request-update", "%d", &val) < 0)