linux-kernel - Re: [PATCH] i2c: imx: move to generic GPIO recovery

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date: Fri, 26 Jan 2024 07:07:19 +0100
From: Oleksij Rempel <o.rempel@...gutronix.de>
To: Esben Haabendal <esben@...nix.com>
Cc: linux-i2c@...r.kernel.org,
	Gregor Herburger <gregor.herburger@...tq-group.com>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Andi Shyti <andi.shyti@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	NXP Linux Team <linux-imx@....com>, linux-kernel@...r.kernel.org,
	Jinjie Ruan <ruanjinjie@...wei.com>,
	Alexander Stein <alexander.stein@...tq-group.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] i2c: imx: move to generic GPIO recovery

Hi,

On Thu, Jan 25, 2024 at 02:56:36PM +0100, Esben Haabendal wrote:
> Starting with
> commit 75820314de26 ("i2c: core: add generic I2C GPIO recovery")
> GPIO bus recovery is supported by the I2C core, so we can remove the
> driver implementation and use that one instead.
> 
> As a nice side-effect, pinctrl becomes optional, allowing bus recovery on
> LS1021A, which does not have such luxury, but can be wired up to use extra
> fixed GPIO pins.
> 
> Note: The previous error messages about bus recovery not being supported is
> dropped with this change. Given that it is perfectly possible to have platforms
> where bus recovery works without pinctrl support, I happen to work on one such,
> both error messages does not really make sense in those cases. And I don't see
> how to know if this is the case or not.
> 
> Signed-off-by: Esben Haabendal <esben@...nix.com>

Thank you for your work.

> ---
...
> +	struct i2c_bus_recovery_info *bri = &i2c_imx->rinfo;
>  
> -	dev_dbg(&pdev->dev, "using scl%s for recovery\n",
> -		rinfo->sda_gpiod ? ",sda" : "");
> +	bri->pinctrl = devm_pinctrl_get(&pdev->dev);
> +	if (IS_ERR(bri->pinctrl))
> +		return PTR_ERR(bri->pinctrl);

According to the commit message - "pinctrl becomes optional", but this
code stops probe if pinctrl will fail for one or another reason. I do
not see any place returning NULL on fail. Do I'm missing something?

Regards,
Oleksij
-- 
Pengutronix e.K.                           |                             |
Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |