linux-kernel - Re: [PATCH 1/3] media: uvcvideo: Refactor uvc_queue

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Message-ID: <CANiDSCvesD5QzVuAAG6ofZ3NT0z9yVkycS3VSnxeGTqK4UP18Q@mail.gmail.com>
Date: Fri, 23 May 2025 09:44:38 +0200
From: Ricardo Ribalda <ribalda@...omium.org>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc: Hans de Goede <hdegoede@...hat.com>, Hans Verkuil <hans@...erkuil.nl>, 
	Mauro Carvalho Chehab <mchehab@...nel.org>, linux-media@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] media: uvcvideo: Refactor uvc_queue_streamon

Hi Laurent

Thanks for your review

On Thu, 22 May 2025 at 23:40, Laurent Pinchart
<laurent.pinchart@...asonboard.com> wrote:
>
> Hi Ricardo,
>
> Thank you for the patch.
>
> On Thu, May 22, 2025 at 05:58:46PM +0000, Ricardo Ribalda wrote:
> > Do uvc_pm_get before we call uvc_queue_streamon. Although the current
> > code is correct, uvc_ioctl_streamon is allways called after uvc_pm_get,
> > this change makes the code more resiliant to future changes.
> >
> > Suggested-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> > Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

Unless you say otherwise I will copy this Review-by to the original
series where this patch belongs to.
https://patchwork.linuxtv.org/project/linux-media/list/?series=15227

Thanks!


>
> > ---
> >  drivers/media/usb/uvc/uvc_v4l2.c | 7 ++++---
> >  1 file changed, 4 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
> > index 668a4e9d772c6d91f045ca75e2744b3a6c69da6b..862b4e34e5b629cf324479a9bb59ebe8784ccd5d 100644
> > --- a/drivers/media/usb/uvc/uvc_v4l2.c
> > +++ b/drivers/media/usb/uvc/uvc_v4l2.c
> > @@ -853,15 +853,16 @@ static int uvc_ioctl_streamon(struct file *file, void *fh,
> >       if (handle->is_streaming)
> >               return 0;
> >
> > -     ret = uvc_queue_streamon(&stream->queue, type);
> > +     ret = uvc_pm_get(stream->dev);
> >       if (ret)
> >               return ret;
> >
> > -     ret = uvc_pm_get(stream->dev);
> > +     ret = uvc_queue_streamon(&stream->queue, type);
> >       if (ret) {
> > -             uvc_queue_streamoff(&stream->queue, type);
> > +             uvc_pm_put(stream->dev);
> >               return ret;
> >       }
> > +
> >       handle->is_streaming = true;
> >
> >       return 0;
>
> --
> Regards,
>
> Laurent Pinchart



-- 
Ricardo Ribalda