linux-kernel - Re: [PATCH 0/2] cpufreq: sun50i: fix memory leak and remove of_node

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Message-ID: <20240520093237.fucml6sp2ziygyav@vireshk-i7>
Date: Mon, 20 May 2024 15:02:37 +0530
From: Viresh Kumar <viresh.kumar@...aro.org>
To: Javier Carrasco <javier.carrasco.cruz@...il.com>
Cc: Yangtao Li <tiny.windzz@...il.com>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Chen-Yu Tsai <wens@...e.org>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Samuel Holland <samuel@...lland.org>,
	Andre Przywara <andre.przywara@....com>,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>,
	linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] cpufreq: sun50i: fix memory leak and remove
 of_node_put()

On 03-05-24, 19:52, Javier Carrasco wrote:
> This series fixes a memory leak by means of the _scoped version of the
> for_each_child_of_node() loop, which was recently introduced with
> 34af4554fb0c ("of: Introduce for_each_*_child_of_node_scoped() to
> automate of_node_put() handling").
> 
> The new approach is still not widely used, but this might be a good
> occasion to use it in a driver because it actually fixes a bug, and
> the loop is rather simple.
> 
> The creator of the new macro was added to the discussion in case the
> new approach is still not mature enough, even for such simple case.
> 
> Additionally, the existing uses of of_node_put() have been removed to
> favour the _free() cleanup handler, which reduces the chances of having
> any other memory leak because some of_node_put() is missing as well as
> simplifies the current code.
> 
> I don't have the real hardware to test the series, so I "faked" the node
> in a device tree for an arm64 device (Rockchip) and hacked the driver
> to get to run dt_has_supported_hw(). The new implementation works as
> expected, but if someone wants to test it with the proper SoC,
> additional tests are always welcome. The same applies for the removals
> of of_node_put().
> 
> Signed-off-by: Javier Carrasco <javier.carrasco.cruz@...il.com>
> ---
> Javier Carrasco (2):
>       cpufreq: sun50i: fix memory leak in dt_has_supported_hw()
>       cpufreq: sun50i: replace of_node_put() with automatic cleanup handler

Applied. Thanks.

-- 
viresh