linux-kernel - Re: [PATCH v2 0/4] media: uvcvideo: Prepare deprecation of nodrop

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Message-ID: <7d61cb1b-292c-4b19-b972-1666ba2a0a83@redhat.com>
Date: Wed, 18 Dec 2024 22:52:53 +0100
From: Hans de Goede <hdegoede@...hat.com>
To: Ricardo Ribalda <ribalda@...omium.org>,
 Laurent Pinchart <laurent.pinchart@...asonboard.com>,
 Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/4] media: uvcvideo: Prepare deprecation of nodrop

Hi,

On 18-Dec-24 10:39 PM, Ricardo Ribalda wrote:
> We intend to deprecate the nodrop parameter in the future and adopt the
> default behaviour of the other media drivers: return buffers with an error
> to userspace with V4L2_BUF_FLAG_ERROR set in v4l2_buffer.flags.
> 
> Make the first step in the deprecation by changing the default value of
> the parameter and printing an error message when the value is changed.
> 
> While implementing this change, Hans found an error in
> uvc_queue_buffer_complete(). This series also fix it.
> 
> Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
> ---
> Changes in v2:
> - Improve cover letter wording.
> - Add new patch to fix vb2_buffer_done()
> - Link to v1: https://lore.kernel.org/r/20241217-uvc-deprecate-v1-0-57d353f68f8f@chromium.org

Thank you the entire v2 series looks good to me:

Reviewed-by: Hans de Goede <hdegoede@...hat.com>

for the series, assuming you have tested that
the modparam magic in patch 4/4 works as expected?

Regards,

Hans




> 
> ---
> Ricardo Ribalda (4):
>       media: uvcvideo: Propagate buf->error to userspace
>       media: uvcvideo: Invert default value for nodrop module param
>       media: uvcvideo: Allow changing noparam on the fly
>       media: uvcvideo: Announce the user our deprecation intentions
> 
>  drivers/media/usb/uvc/uvc_driver.c | 23 ++++++++++++++++++++---
>  drivers/media/usb/uvc/uvc_queue.c  |  9 ++++-----
>  drivers/media/usb/uvc/uvcvideo.h   |  4 +---
>  3 files changed, 25 insertions(+), 11 deletions(-)
> ---
> base-commit: d216d9cb4dd854ef0a2ec1701f403facb298af51
> change-id: 20241217-uvc-deprecate-fbd6228fa1e2
> 
> Best regards,