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 <rusty@rustcorp.com.au>
diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index 26afb56..fae2dbb 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -1986,7 +1986,10 @@
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;