From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756670Ab2IUQGj (ORCPT ); Fri, 21 Sep 2012 12:06:39 -0400 Received: from smtp.citrix.com ([66.165.176.89]:58717 "EHLO SMTP.CITRIX.COM" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754914Ab2IUQFT (ORCPT ); Fri, 21 Sep 2012 12:05:19 -0400 X-IronPort-AV: E=Sophos;i="4.80,463,1344211200"; d="scan'208";a="38744202" From: David Vrabel To: xen-devel@lists.xensource.com CC: "David Vrabel" , Konrad Rzeszutek Wilk , linux-kernel@vger.kernel.org Subject: [PATCH 2/6] xen-blkfront: handle backend CLOSED without CLOSING Date: Fri, 21 Sep 2012 17:04:20 +0100 Message-ID: <1348243464-15903-3-git-send-email-david.vrabel@citrix.com> X-Mailer: git-send-email 1.7.2.5 In-Reply-To: <1348243464-15903-1-git-send-email-david.vrabel@citrix.com> References: <1348243464-15903-1-git-send-email-david.vrabel@citrix.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@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 --- drivers/block/xen-blkfront.c | 5 ++++- 1 files changed, 4 insertions(+), 1 deletions(-) diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c index 2c2d2e5..8da12a9 100644 --- a/drivers/block/xen-blkfront.c +++ b/drivers/block/xen-blkfront.c @@ -1340,13 +1340,16 @@ static void blkback_changed(struct xenbus_device *dev, case XenbusStateReconfiguring: case XenbusStateReconfigured: case XenbusStateUnknown: - case XenbusStateClosed: break; case XenbusStateConnected: blkfront_connect(info); break; + case XenbusStateClosed: + if (dev->state == XenbusStateClosed) + break; + /* Missed the backend's Closing state -- fallthrough */ case XenbusStateClosing: blkfront_closing(info); break; -- 1.7.2.5