[PATCH v2] virtio: fix boot device hunting in qemu with virtio

[Kuan-Wei Chiu]

On Mon, May 04, 2026 at 09:10:23AM +0200, Ludwig Nussel wrote:
> Commit 70101c3217ae ("virtio: mmio: Return error codes on probe
> failures") returns -ENODEV where it would return 0 before. That path is
> apparently hit in qemu and breaks boot device discovery
> (virtio_bootdev_hunt() expects only ENOENT). So return -ENOENT in
> that path instead.
> The remaining two error returns in the function are untouched as I
> don't know where they play a role.
> 
> Signed-off-by: Ludwig Nussel <ludwig.nussel at siemens.com>

Acked-by: Kuan-Wei Chiu <visitorckw at gmail.com>

Regards,
Kuan-Wei

> 
> ---
> 
> Changes in v2:
>  - return ENOENT in probe()
> 
>  drivers/virtio/virtio_mmio.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c
> index 62afe609ec0..d90d8309f99 100644
> --- a/drivers/virtio/virtio_mmio.c
> +++ b/drivers/virtio/virtio_mmio.c
> @@ -372,7 +372,7 @@ static int virtio_mmio_probe(struct udevice *udev)
>  		 * virtio-mmio device with an ID 0 is a (dummy) placeholder
>  		 * with no function. End probing now with no error reported.
>  		 */
> -		return -ENODEV;
> +		return -ENOENT;
>  	}
>  	uc_priv->vendor = readl(priv->base + VIRTIO_MMIO_VENDOR_ID);
>  
> -- 
> 2.43.0
> 
> base-commit: 4433253ecf2041f9362a763bb6cb79960921ac7e
> branch: us-virtio2