Commit 2d9becc1 authored Jan 12, 2015 by Michael S. Tsirkin Committed by Rusty Russell Jan 21, 2015

virtio/balloon: verify device has config space



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

parent 8cab3cd6

drivers/virtio/virtio_balloon.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -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;