linux-kernel - Re: [PATCH v3 2/8] w1: Add w1_find_master

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Date: Fri, 15 Mar 2024 19:40:56 +0000
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Ayush Singh <ayushdevel1325@...il.com>
Cc: linux-kernel@...r.kernel.org, jkridner@...gleboard.org,
	robertcnelson@...gleboard.org,
	Vaishnav M A <vaishnav@...gleboard.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>, Nishanth Menon <nm@...com>,
	Vignesh Raghavendra <vigneshr@...com>,
	Tero Kristo <kristo@...nel.org>,
	Derek Kiernan <derek.kiernan@....com>,
	Dragan Cvetic <dragan.cvetic@....com>,
	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>, Jiri Slaby <jirislaby@...nel.org>,
	Johan Hovold <johan@...nel.org>, Alex Elder <elder@...nel.org>,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-spi@...r.kernel.org, linux-serial@...r.kernel.org,
	greybus-dev@...ts.linaro.org
Subject: Re: [PATCH v3 2/8] w1: Add w1_find_master_device

On Sat, Mar 16, 2024 at 12:19:00AM +0530, Ayush Singh wrote:
> diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c
> index afb1cc4606c5..ce8a3f93f2ef 100644
> --- a/drivers/w1/w1.c
> +++ b/drivers/w1/w1.c
> @@ -673,9 +673,9 @@ static int __w1_attach_slave_device(struct w1_slave *sl)
>  	sl->dev.of_node = of_find_matching_node(sl->master->dev.of_node,
>  						sl->family->of_match_table);
>  
> -	dev_set_name(&sl->dev, "%02x-%012llx",
> -		 (unsigned int) sl->reg_num.family,
> -		 (unsigned long long) sl->reg_num.id);
> +	dev_set_name(&sl->dev, "%s-%02x-%012llx", sl->master->name,
> +		     (unsigned int)sl->reg_num.family,
> +		     (unsigned long long)sl->reg_num.id);

This is a user visible change likely to cause breakage. I know that I've
written programmes for reading the DS18B20 temperature probes that
depend on the sysfs device name remaining stable. The same is likely
true of other program authors.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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