Commit 7754f53e authored Jan 12, 2015 by Michael S. Tsirkin Committed by Rusty Russell Jan 21, 2015

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 <mst@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

parent 7f870c81

net/9p/trans_virtio.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -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");