From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752643AbbAMOnh (ORCPT ); Tue, 13 Jan 2015 09:43:37 -0500 Received: from mx1.redhat.com ([209.132.183.28]:35098 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752442AbbAMOnf (ORCPT ); Tue, 13 Jan 2015 09:43:35 -0500 Date: Tue, 13 Jan 2015 16:43:27 +0200 From: "Michael S. Tsirkin" To: linux-kernel@vger.kernel.org Cc: Rusty Russell , virtualization@lists.linux-foundation.org Subject: [PATCH 6/6] virtio/balloon: verify device has config space Message-ID: <1421160167-18498-7-git-send-email-mst@redhat.com> References: <1421160167-18498-1-git-send-email-mst@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1421160167-18498-1-git-send-email-mst@redhat.com> X-Mutt-Fcc: =sent Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Some devices might not implement config space access (e.g. remoteproc used not to - before 3.9). virtio/balloon needs config space access so make it fail gracefully if not there. Signed-off-by: Michael S. Tsirkin --- drivers/virtio/virtio_balloon.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c index 50c5f42..3176ea4 100644 --- a/drivers/virtio/virtio_balloon.c +++ b/drivers/virtio/virtio_balloon.c @@ -466,6 +466,12 @@ static int virtballoon_probe(struct virtio_device *vdev) struct virtio_balloon *vb; int err; + if (!vdev->config->get) { + dev_err(&vdev->dev, "%s failure: config access disabled\n", + __func__); + return -EINVAL; + } + vdev->priv = vb = kmalloc(sizeof(*vb), GFP_KERNEL); if (!vb) { err = -ENOMEM; -- MST