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d="scan'208";a="5720020" From: Paul Durrant To: , , Date: Wed, 18 Sep 2019 12:57:02 +0100 Message-ID: <20190918115702.38959-1-paul.durrant@citrix.com> X-Mailer: git-send-email 2.20.1.2.gb21ebb671 MIME-Version: 1.0 X-detected-operating-system: by eggs.gnu.org: FreeBSD 9.x X-Received-From: 216.71.145.153 Subject: [Qemu-devel] [PATCH] xen-block: treat XenbusStateUnknown the same as XenbusStateClosed X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , Stefano Stabellini , Max Reitz , Paul Durrant , Anthony Perard , Mark Syms Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" When a frontend gracefully disconnects from an offline backend, it will set its own state to XenbusStateClosed. The code in xen-block.c correctly deals with this and sets the backend into XenbusStateClosed. Unfortunately it is possible for toolstack to actually delete the frontend area before the state key has been read, leading to an apparent frontend state of XenbusStateUnknown. This prevents the backend state from transitioning to XenbusStateClosed and hence leaves it limbo. This patch simply treats a frontend state of XenbusStateUnknown the same as XenbusStateClosed, which will unblock the backend in these circumstances. Reported-by: Mark Syms Signed-off-by: Paul Durrant Acked-by: Anthony PERARD Reviewed-by: John Snow --- Cc: Stefano Stabellini Cc: Anthony Perard Cc: Kevin Wolf Cc: Max Reitz --- hw/block/xen-block.c | 1 + 1 file changed, 1 insertion(+) diff --git a/hw/block/xen-block.c b/hw/block/xen-block.c index f77343db60..879fc310a4 100644 --- a/hw/block/xen-block.c +++ b/hw/block/xen-block.c @@ -313,6 +313,7 @@ static void xen_block_frontend_changed(XenDevice *xendev, break; case XenbusStateClosed: + case XenbusStateUnknown: xen_block_disconnect(xendev, &local_err); if (local_err) { error_propagate(errp, local_err);