linux-kernel - Re: [PATCH] virtio_snd.h: clarify that `controls` depends on VIRTIO_SND_F

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Message-ID: <CAJaqyWerCoW-yokJnTsnkaCeNFCuemKV+6b+9_7xn6+5H5OHPQ@mail.gmail.com>
Date: Fri, 14 Feb 2025 09:28:18 +0100
From: Eugenio Perez Martin <eperezma@...hat.com>
To: Stefano Garzarella <sgarzare@...hat.com>
Cc: virtualization@...ts.linux.dev, 
	Matias Ezequiel Vara Larsen <mvaralar@...hat.com>, linux-sound@...r.kernel.org, 
	Jason Wang <jasowang@...hat.com>, linux-kernel@...r.kernel.org, 
	Anton Yakovlev <anton.yakovlev@...nsynergy.com>, Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, 
	"Michael S. Tsirkin" <mst@...hat.com>
Subject: Re: [PATCH] virtio_snd.h: clarify that `controls` depends on VIRTIO_SND_F_CTLS

On Thu, Feb 13, 2025 at 5:18 PM Stefano Garzarella <sgarzare@...hat.com> wrote:
>
> As defined in the specification, the `controls` field in the configuration
> space is only valid/present if VIRTIO_SND_F_CTLS is negotiated.
>
>   From https://docs.oasis-open.org/virtio/virtio/v1.3/virtio-v1.3.html:
>
>   5.14.4 Device Configuration Layout
>     ...
>     controls
>        (driver-read-only) indicates a total number of all available control
>        elements if VIRTIO_SND_F_CTLS has been negotiated.
>
> Let's use the same style used in virtio_blk.h to clarify this and to avoid
> confusion as happened in QEMU (see link).
>
> Link: https://gitlab.com/qemu-project/qemu/-/issues/2805
> Signed-off-by: Stefano Garzarella <sgarzare@...hat.com>

Acked-by: Eugenio Pérez <eperezma@...hat.com>

> ---
>  include/uapi/linux/virtio_snd.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/include/uapi/linux/virtio_snd.h b/include/uapi/linux/virtio_snd.h
> index 5f4100c2cf04..a4cfb9f6561a 100644
> --- a/include/uapi/linux/virtio_snd.h
> +++ b/include/uapi/linux/virtio_snd.h
> @@ -25,7 +25,7 @@ struct virtio_snd_config {
>         __le32 streams;
>         /* # of available channel maps */
>         __le32 chmaps;
> -       /* # of available control elements */
> +       /* # of available control elements (if VIRTIO_SND_F_CTLS) */
>         __le32 controls;
>  };
>
> --
> 2.48.1
>