Re: [PATCH] media: uvcvideo: Skip frame descriptors with a zero computed size

[Ricardo Ribalda]

Hi Natasha

On Tue, 18 Aug 2026 at 12:32, Natasha Klaus
<natalie.klaus@xxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> Understood on the placement, thanks.
>
> One finding while building your refactor: it does not compile as written.
> Dropping the uvc_dbg() removes the last use of alts in uvc_parse_frame(), and
> the kernel treats that as an error:
>
>   drivers/media/usb/uvc/uvc_driver.c:233:36: error: unused variable 'alts'
>   [-Werror=unused-variable]
>
> I removed the now-dead declaration, which adds a hunk you did not specify. Say
> if you would rather keep alts and identify the device explicitly in the
> dev_warn() instead.
>
> I also wrote the dev_warn() text, since you specified the level but not the
> wording:
>
>   dev_warn(&streaming->intf->dev,
>            "UVC non compliance: FRAME descriptor is %d bytes, expected at least %u.\n",
>            buflen, 26 + 4 * n);

I believe that I wrote :) :
+               dev_warn(&streaming->intf->dev,
+                        "UVC non compliance: device %d videostreaming
interface %d FRAME error\n",
+                        dev->udev->devnum, alts->desc.bInterfaceNumber);

But anyway... I think dev_warn with intf->dev is more than enough. I
prefer your message.
Thanks for that

>
> Happy to change it.
>
> To carry your refactor as 1/3 with you as author I need your Signed-off-by.
> Could you send it, or tell me if you would rather I take authorship with a
> Suggested-by: line pointing at your message.

Suggested-by is more than enough.

Thanks!

>
> Natasha



-- 
Ricardo Ribalda