linux-kernel - Re: [PATCH v5 04/12] driver core: Constify API device_find

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Message-ID: <20241224162336.00002486@huawei.com>
Date: Tue, 24 Dec 2024 16:23:36 +0000
From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
To: Zijun Hu <zijun_hu@...oud.com>
CC: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Linus Walleij
	<linus.walleij@...aro.org>, Bartosz Golaszewski <brgl@...ev.pl>, Uwe
 Kleine-König <ukleinek@...nel.org>, James Bottomley
	<James.Bottomley@...senPartnership.com>, Thomas Weißschuh <thomas@...ch.de>, <linux-kernel@...r.kernel.org>,
	<nvdimm@...ts.linux.dev>, <linux-sound@...r.kernel.org>,
	<sparclinux@...r.kernel.org>, <linux-block@...r.kernel.org>,
	<linux-cxl@...r.kernel.org>, <linux1394-devel@...ts.sourceforge.net>,
	<arm-scmi@...r.kernel.org>, <linux-efi@...r.kernel.org>,
	<linux-gpio@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
	<linux-mediatek@...ts.infradead.org>, <linux-hwmon@...r.kernel.org>,
	<linux-media@...r.kernel.org>, <linux-pwm@...r.kernel.org>,
	<linux-remoteproc@...r.kernel.org>, <linux-scsi@...r.kernel.org>,
	<linux-usb@...r.kernel.org>, <linux-serial@...r.kernel.org>,
	<netdev@...r.kernel.org>, Zijun Hu <quic_zijuhu@...cinc.com>, "Alison
 Schofield" <alison.schofield@...el.com>, Takashi Sakamoto
	<o-takashi@...amocchi.jp>
Subject: Re: [PATCH v5 04/12] driver core: Constify API device_find_child()
 and adapt for various usages

On Tue, 24 Dec 2024 21:05:03 +0800
Zijun Hu <zijun_hu@...oud.com> wrote:

> From: Zijun Hu <quic_zijuhu@...cinc.com>
> 
> Constify the following API:
> struct device *device_find_child(struct device *dev, void *data,
> 		int (*match)(struct device *dev, void *data));
> To :
> struct device *device_find_child(struct device *dev, const void *data,
>                                  device_match_t match);
> typedef int (*device_match_t)(struct device *dev, const void *data);
> with the following reasons:
> 
> - Protect caller's match data @*data which is for comparison and lookup
>   and the API does not actually need to modify @*data.
> 
> - Make the API's parameters (@match)() and @data have the same type as
>   all of other device finding APIs (bus|class|driver)_find_device().
> 
> - All kinds of existing device match functions can be directly taken
>   as the API's argument, they were exported by driver core.
> 
> Constify the API and adapt for various existing usages.
> 
> BTW, various subsystem changes are squashed into this commit to meet
> 'git bisect' requirement, and this commit has the minimal and simplest
> changes to complement squashing shortcoming, and that may bring extra
> code improvement.
> 
> Reviewed-by: Alison Schofield <alison.schofield@...el.com>
> Reviewed-by: Takashi Sakamoto <o-takashi@...amocchi.jp>
> Acked-by: Uwe Kleine-König <ukleinek@...nel.org> # for drivers/pwm
> Signed-off-by: Zijun Hu <quic_zijuhu@...cinc.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>