Re: [Xen-devel] [PATCH 4/5] xen-fbfront: handle backend CLOSED without CLOSING

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Thu, Oct 18, 2012 at 11:03:37AM +0100, David Vrabel wrote:
> From: David Vrabel <david.vrabel@xxxxxxxxxx>
> 
> Backend drivers shouldn't transistion to CLOSED unless the frontend is
> CLOSED.  If a backend does transition to CLOSED too soon then the
> frontend may not see the CLOSING state and will not properly shutdown.
> 
> So, treat an unexpected backend CLOSED state the same as CLOSING.
> 
> Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx>
> Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> ---
> Cc: linux-fbdev@xxxxxxxxxxxxxxx
> Cc: Florian Tobias Schandinat <FlorianSchandinat@xxxxxx>

Hey Florian,

Should I prep a git pull for you with this or would it be OK
if I just have your Ack to put this in my git pull for Linus?

Thanks!
> ---
>  drivers/video/xen-fbfront.c |    5 ++++-
>  1 files changed, 4 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/video/xen-fbfront.c b/drivers/video/xen-fbfront.c
> index b7f5173..917bb56 100644
> --- a/drivers/video/xen-fbfront.c
> +++ b/drivers/video/xen-fbfront.c
> @@ -641,7 +641,6 @@ static void xenfb_backend_changed(struct xenbus_device 
> *dev,
>       case XenbusStateReconfiguring:
>       case XenbusStateReconfigured:
>       case XenbusStateUnknown:
> -     case XenbusStateClosed:
>               break;
>  
>       case XenbusStateInitWait:
> @@ -670,6 +669,10 @@ InitWait:
>               info->feature_resize = val;
>               break;
>  
> +     case XenbusStateClosed:
> +             if (dev->state == XenbusStateClosed)
> +                     break;
> +             /* Missed the backend's CLOSING state -- fallthrough */
>       case XenbusStateClosing:
>               xenbus_frontend_closed(dev);
>               break;
> -- 
> 1.7.2.5

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