On (Mon) 09 Feb 2015 [10:26:29], Rusty Russell wrote:
> virtio: don't require a config space on the console device.
>
> Strictly, it's only needed when we have features (size or multiport).
>
> Signed-off-by: Rusty Russell <ru...@rustcorp.com.au>
Reviewed-by: Amit Shah <amit.s...@redhat.com>
> diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
> index 26afb56a8073..fae2dbbf5745 100644
> --- a/drivers/char/virtio_console.c
> +++ b/drivers/char/virtio_console.c
> @@ -1986,7 +1986,10 @@ static int virtcons_probe(struct virtio_device *vdev)
> bool multiport;
> bool early = early_put_chars != NULL;
>
> - if (!vdev->config->get) {
> + /* We only need a config space if features are offered */
> + if (!vdev->config->get &&
> + (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_SIZE)
> + || virtio_has_feature(vdev, VIRTIO_CONSOLE_F_MULTIPORT))) {
> dev_err(&vdev->dev, "%s failure: config access disabled\n",
> __func__);
> return -EINVAL;
Amit
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