From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Vrabel Date: Fri, 21 Sep 2012 16:04:22 +0000 Subject: [PATCH 4/6] xen-fbfront: handle backend CLOSED without CLOSING Message-Id: <1348243464-15903-5-git-send-email-david.vrabel@citrix.com> List-Id: References: <1348243464-15903-1-git-send-email-david.vrabel@citrix.com> In-Reply-To: <1348243464-15903-1-git-send-email-david.vrabel@citrix.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: xen-devel@lists.xensource.com Cc: David Vrabel , Konrad Rzeszutek Wilk , linux-kernel@vger.kernel.org, linux-fbdev@vger.kernel.org From: David Vrabel 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 Cc: --- 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