Re: [Qemu-devel] [PATCH] xen-bus: check whether the frontend is active during device reset...

[Anthony PERARD <anthony.perard@citrix.com>]

On Tue, Sep 10, 2019 at 06:17:53PM +0100, Paul Durrant wrote:
> ...not the backend
> 
> Commit cb323146 "xen-bus: Fix backend state transition on device reset"
> contained a subtle mistake. The hunk
> 
> @@ -539,11 +556,11 @@ static void xen_device_backend_changed(void *opaque)
> 
>      /*
>       * If the toolstack (or unplug request callback) has set the backend
> -     * state to Closing, but there is no active frontend (i.e. the
> -     * state is not Connected) then set the backend state to Closed.
> +     * state to Closing, but there is no active frontend then set the
> +     * backend state to Closed.
>       */
>      if (xendev->backend_state == XenbusStateClosing &&
> -        xendev->frontend_state != XenbusStateConnected) {
> +        !xen_device_state_is_active(state)) {
>          xen_device_backend_set_state(xendev, XenbusStateClosed);
>      }
> 
> mistakenly replaced the check of 'xendev->frontend_state' with a check
> (now in a helper function) of 'state', which actually equates to
> 'xendev->backend_state'.
> 
> This patch fixes the mistake.
> 
> Fixes: cb3231460747552d70af9d546dc53d8195bcb796
> Signed-off-by: Paul Durrant <paul.durrant@citrix.com>

Reviewed-by: Anthony PERARD <anthony.perard@citrix.com>

Thanks,

-- 
Anthony PERARD