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virtio/balloon: verify device has config space

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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>
This commit is contained in:
Michael S. Tsirkin 2015-01-12 16:23:37 +02:00 committed by Rusty Russell
parent 8cab3cd6ad
commit 2d9becc1e0
1 changed files with 6 additions and 0 deletions
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6
drivers/virtio/virtio_balloon.c
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@ -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;