linux-kernel - Re: [PATCH v9 22/22] uvc: use vb2 ioctl and fop helpers

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Message-ID: <CAAFQd5BCydvzYx4FGyNQSbrT9twGVcFGn2vTfsvLHKYdRhE8GQ@mail.gmail.com>
Date:   Fri, 2 Apr 2021 11:50:44 +0900
From:   Tomasz Figa <tfiga@...omium.org>
To:     Ricardo Ribalda <ribalda@...omium.org>
Cc:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Hans Verkuil <hverkuil@...all.nl>
Subject: Re: [PATCH v9 22/22] uvc: use vb2 ioctl and fop helpers

Hi Ricardo,

On Fri, Mar 26, 2021 at 7:00 PM Ricardo Ribalda <ribalda@...omium.org> wrote:
>
> From: Hans Verkuil <hverkuil@...all.nl>
>
> When uvc was written the vb2 ioctl and file operation helpers didn't exist.
>
> This patch switches uvc over to those helpers, which removes a lot of boilerplate
> code and simplifies VIDIOC_G/S_PRIORITY handling and allows us to drop the
> 'privileges' scheme, since that's now handled inside the vb2 helpers.
>
> This makes it possible for uvc to pass the v4l2-compliance streaming tests.
>
> Signed-off-by: Hans Verkuil <hverkuil-cisco@...all.nl>

Thanks for the patch. Did you perhaps miss adding your sign-off?

Also, see my comments inline.

[snip]
> @@ -1166,11 +969,6 @@ static int uvc_ioctl_s_parm(struct file *file, void *fh,
>  {
>         struct uvc_fh *handle = fh;
>         struct uvc_streaming *stream = handle->stream;
> -       int ret;
> -
> -       ret = uvc_acquire_privileges(handle);
> -       if (ret < 0)
> -               return ret;

Why is it okay not to acquire the privileges here?

>
>         return uvc_v4l2_set_streamparm(stream, parm);
>  }

Best regards,
Tomasz