linux-kernel - Re: [PATCH v4 05/11] driver core: Simplify API device_find_child_by

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Message-ID: <20241223203935.00003de0@huawei.com>
Date: Mon, 23 Dec 2024 20:39:35 +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>
Subject: Re: [PATCH v4 05/11] driver core: Simplify API
 device_find_child_by_name() implementation

On Wed, 11 Dec 2024 08:08:07 +0800
Zijun Hu <zijun_hu@...oud.com> wrote:

> From: Zijun Hu <quic_zijuhu@...cinc.com>
> 
> Simplify device_find_child_by_name() implementation by both existing
> API device_find_child() and device_match_name().
There is a subtle difference.  In theory old code could dereference a NULL
if parent->p == NULL, now it can't.  Sounds at most like a harmless change but
maybe you should mention it.

Otherwise LGTM
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>

> 
> Signed-off-by: Zijun Hu <quic_zijuhu@...cinc.com>
> ---
>  drivers/base/core.c | 13 +------------
>  1 file changed, 1 insertion(+), 12 deletions(-)
> 
> diff --git a/drivers/base/core.c b/drivers/base/core.c
> index bc3b523a4a6366080c3c9fd190e54c7fd13c8ded..8116bc8dd6e9eba0653ca686a90c7008de9e2840 100644
> --- a/drivers/base/core.c
> +++ b/drivers/base/core.c
> @@ -4110,18 +4110,7 @@ EXPORT_SYMBOL_GPL(device_find_child);
>  struct device *device_find_child_by_name(struct device *parent,
>  					 const char *name)
>  {
> -	struct klist_iter i;
> -	struct device *child;
> -
> -	if (!parent)
> -		return NULL;
> -
> -	klist_iter_init(&parent->p->klist_children, &i);
> -	while ((child = next_device(&i)))
> -		if (sysfs_streq(dev_name(child), name) && get_device(child))
> -			break;
> -	klist_iter_exit(&i);
> -	return child;
> +	return device_find_child(parent, name, device_match_name);
>  }
>  EXPORT_SYMBOL_GPL(device_find_child_by_name);
>  
>