From 7754f53e944122fa95ef36039d3a5009910ce6fc Mon Sep 17 00:00:00 2001 From: "Michael S. Tsirkin" Date: Mon, 12 Jan 2015 16:23:37 +0200 Subject: [PATCH] virtio/9p: verify device has config space 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 Signed-off-by: Rusty Russell --- 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 daa749c8b3fb..d8e376a5f0f1 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"); -- 2.30.2