From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Michael S. Tsirkin" Subject: [PATCH 1/6] virtio/9p: verify device has config space Date: Tue, 13 Jan 2015 16:43:10 +0200 Message-ID: <1421160167-18498-2-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 Cc: Eric Van Hensbergen , Ron Minnich , Latchesar Ionkov , "David S. Miller" , v9fs-developer@lists.sourceforge.net, netdev@vger.kernel.org To: linux-kernel@vger.kernel.org Return-path: Content-Disposition: inline In-Reply-To: <1421160167-18498-1-git-send-email-mst@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org Some devices might not implement config space access (e.g. remoteproc used not to - before 3.9). virtio/9p needs config space access so make it fail gracefully if not there. Signed-off-by: Michael S. Tsirkin --- net/9p/trans_virtio.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/net/9p/trans_virtio.c b/net/9p/trans_virtio.c index daa749c..d8e376a 100644 --- a/net/9p/trans_virtio.c +++ b/net/9p/trans_virtio.c @@ -524,6 +524,12 @@ static int p9_virtio_probe(struct virtio_device *vdev) int err; struct virtio_chan *chan; + if (!vdev->config->get) { + dev_err(&vdev->dev, "%s failure: config access disabled\n", + __func__); + return -EINVAL; + } + chan = kmalloc(sizeof(struct virtio_chan), GFP_KERNEL); if (!chan) { pr_err("Failed to allocate virtio 9P channel\n"); -- MST