Re: [Xen-devel] [PATCH] xen, fbfront: fix connecting to backend

[Juergen Gross <jgross@xxxxxxxx>]

On 23/03/17 13:52, Juergen Gross wrote:
> 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@xxxxxxxxxxxxxxx
> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>

Bartlomiej, any comments? Can you please take this patch or should I
carry it through the Xen tree?


Juergen

> ---
>  drivers/video/fbdev/xen-fbfront.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/video/fbdev/xen-fbfront.c 
> b/drivers/video/fbdev/xen-fbfront.c
> index d0115a7..3ee309c 100644
> --- a/drivers/video/fbdev/xen-fbfront.c
> +++ b/drivers/video/fbdev/xen-fbfront.c
> @@ -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 @@ 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_read_unsigned(info->xbdev->otherend,
>                                        "request-update", 0))
> 


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