linux-kernel - Re: [PATCH v7 08/16] pinctrl: keembay: release allocated memory in detach path

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Message-ID: <aLbsr4s7nfvCKLnd@smile.fi.intel.com>
Date: Tue, 2 Sep 2025 16:10:07 +0300
From: Andy Shevchenko <andriy.shevchenko@...el.com>
To: Bartosz Golaszewski <brgl@...ev.pl>
Cc: Linus Walleij <linus.walleij@...aro.org>,
	Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konradybcio@...nel.org>,
	Alexey Klimov <alexey.klimov@...aro.org>,
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	Paul Cercueil <paul@...pouillou.net>, Kees Cook <kees@...nel.org>,
	Andy Shevchenko <andy@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Hildenbrand <david@...hat.com>,
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	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Danilo Krummrich <dakr@...nel.org>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Mark Brown <broonie@...nel.org>, linux-gpio@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	linux-mediatek@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org, linux-mips@...r.kernel.org,
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	imx@...ts.linux.dev, linux-omap@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org,
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH v7 08/16] pinctrl: keembay: release allocated memory in
 detach path

On Tue, Sep 02, 2025 at 01:59:17PM +0200, Bartosz Golaszewski wrote:
> 
> Unlike all the other allocations in this driver, the memory for storing
> the pin function descriptions allocated with kcalloc() and later resized
> with krealloc() is never freed. Use devres like elsewhere to handle
> that. While at it - replace krealloc() with more suitable
> devm_krealloc_array().

With that in mind...

> Note: the logic in this module is pretty convoluted and could probably
> use some revisiting, we should probably be able to calculate the exact
> amount of memory needed in advance or even skip the allocation
> altogether and just add each function to the radix tree separately.

...

> Tested-by: Neil Armstrong <neil.armstrong@...aro.org>

This tag is not applicable to all patches, I do not believe this has been
tested.

...

> -	keembay_funcs = kcalloc(kpc->npins * 8, sizeof(*keembay_funcs), GFP_KERNEL);
> +	keembay_funcs = devm_kcalloc(kpc->dev, kpc->npins * 8,

...switching to size_mul() also adds more robustness against too big npins
values.

> +				     sizeof(*keembay_funcs), GFP_KERNEL);

-- 
With Best Regards,
Andy Shevchenko