linux-kernel - Re: [PATCH v4 2/9] media: uvcvideo: Allow external entities

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Date:   Sun, 20 Dec 2020 18:53:04 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Ricardo Ribalda <ribalda@...omium.org>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/9] media: uvcvideo: Allow external entities

Hi Ricardo,

Thank you for the patch.

On Tue, Dec 15, 2020 at 04:44:32PM +0100, Ricardo Ribalda wrote:
> Increase the size of the id, to avoid collisions with external entities.

Could you expand the commit message a bit to explain what external
entities are ?

> Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
> ---
>  drivers/media/usb/uvc/uvc_driver.c | 2 +-
>  drivers/media/usb/uvc/uvcvideo.h   | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
> index 4cdd65d252d9..9f4451a2e0a6 100644
> --- a/drivers/media/usb/uvc/uvc_driver.c
> +++ b/drivers/media/usb/uvc/uvc_driver.c
> @@ -1024,7 +1024,7 @@ static const u8 uvc_media_transport_input_guid[16] =
>  	UVC_GUID_UVC_MEDIA_TRANSPORT_INPUT;
>  static const u8 uvc_processing_guid[16] = UVC_GUID_UVC_PROCESSING;
>  
> -static struct uvc_entity *uvc_alloc_entity(u16 type, u8 id,
> +static struct uvc_entity *uvc_alloc_entity(u16 type, u16 id,
>  		unsigned int num_pads, unsigned int extra_size)
>  {
>  	struct uvc_entity *entity;
> diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
> index df7bf2d104a3..00f985001c1d 100644
> --- a/drivers/media/usb/uvc/uvcvideo.h
> +++ b/drivers/media/usb/uvc/uvcvideo.h
> @@ -301,7 +301,7 @@ struct uvc_entity {
>  					 * chain. */
>  	unsigned int flags;
>  
> -	u8 id;
> +	u16 id; /* 0-255: usb entity. 256-65535: external entities */

How about

	/*
	 * Entities exposed by the UVC device use IDs 0-255, extra entities
	 * implemented by the driver (such as the GPIO entity) use IDs 256 and
	 * up.
	 */

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

>  	u16 type;
>  	char name[64];
>  	u8 guid[16];

-- 
Regards,

Laurent Pinchart