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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>
This commit is contained in:
Rusty Russell 2015-02-11 15:01:14 +10:30
parent 7abb568dbb
commit be8ff5952a
1 changed files with 4 additions and 1 deletions
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5
drivers/char/virtio_console.c
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@ -1986,7 +1986,10 @@ static int virtcons_probe(struct virtio_device *vdev)
bool multiport; bool multiport;
bool early = early_put_chars != NULL; 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", dev_err(&vdev->dev, "%s failure: config access disabled\n",
__func__); __func__);
return -EINVAL; return -EINVAL;