linux-kernel - Re: [PATCH v2 4/4] media: uvcvideo: Announce the user our deprecation intentions

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Message-ID: <20241218232711.GD5518@pendragon.ideasonboard.com>
Date: Thu, 19 Dec 2024 01:27:11 +0200
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Ricardo Ribalda <ribalda@...omium.org>
Cc: Hans de Goede <hdegoede@...hat.com>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/4] media: uvcvideo: Announce the user our
 deprecation intentions

Hi Ricardo,

Thank you for the patch.

On Wed, Dec 18, 2024 at 09:39:11PM +0000, Ricardo Ribalda wrote:
> If the user sets the nodrop parameter, print a deprecation warning once.
> Hopefully they will come to the mailing list if it is an ABI change.
> 
> Now that we have a callback, take this chance to parse the parameter as
> a boolean. We still say to userspace that it is a uint to avoid ABI
> changes.
> 
> Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>

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

> ---
>  drivers/media/usb/uvc/uvc_driver.c | 19 ++++++++++++++++++-
>  1 file changed, 18 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
> index 10812a841587..d8e8675dd2cd 100644
> --- a/drivers/media/usb/uvc/uvc_driver.c
> +++ b/drivers/media/usb/uvc/uvc_driver.c
> @@ -2424,8 +2424,25 @@ module_param_call(clock, uvc_clock_param_set, uvc_clock_param_get,
>  MODULE_PARM_DESC(clock, "Video buffers timestamp clock");
>  module_param_named(hwtimestamps, uvc_hw_timestamps_param, uint, 0644);
>  MODULE_PARM_DESC(hwtimestamps, "Use hardware timestamps");
> -module_param_named(nodrop, uvc_no_drop_param, uint, 0644);
> +
> +static int param_set_nodrop(const char *val, const struct kernel_param *kp)
> +{
> +	pr_warn_once("uvcvideo: "
> +		     DEPRECATED
> +		     "nodrop parameter will be eventually removed.\n");
> +	return param_set_bool(val, kp);
> +}
> +
> +static const struct kernel_param_ops param_ops_nodrop = {
> +	.set = param_set_nodrop,
> +	.get = param_get_uint,
> +};
> +
> +param_check_uint(nodrop, &uvc_no_drop_param);
> +module_param_cb(nodrop, &param_ops_nodrop, &uvc_no_drop_param, 0644);
> +__MODULE_PARM_TYPE(nodrop, "uint");
>  MODULE_PARM_DESC(nodrop, "Don't drop incomplete frames");
> +
>  module_param_named(quirks, uvc_quirks_param, uint, 0644);
>  MODULE_PARM_DESC(quirks, "Forced device quirks");
>  module_param_named(trace, uvc_dbg_param, uint, 0644);

-- 
Regards,

Laurent Pinchart