linux-kernel - Re: [PATCH] clocksource: clps711x: Fix resource leaks in error paths

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Message-ID: <60a236c2-0b36-4a2d-b0f2-40371b8c9236@web.de>
Date: Fri, 1 Aug 2025 16:00:09 +0200
From: Markus Elfring <Markus.Elfring@....de>
To: Zhen Ni <zhen.ni@...ystack.cn>, Thomas Gleixner <tglx@...utronix.de>,
 Daniel Lezcano <daniel.lezcano@...aro.org>
Cc: LKML <linux-kernel@...r.kernel.org>, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] clocksource: clps711x: Fix resource leaks in error paths

> The current implementation of clps711x_timer_init() has multiple error
> paths that directly return without releasing the base I/O memory mapped

How do you think about to add any tags (like “Fixes” and “Cc”) accordingly?
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?h=v6.16#n145


> via of_iomap(). This leads to resource leaks when:

Please reconsider the need for the presented enumeration once more.

See also:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?h=v6.16#n94


…
> +++ b/drivers/clocksource/clps711x-timer.c
> @@ -78,24 +78,34 @@ static int __init clps711x_timer_init(struct device_node *np)
…
> -	return 0;
> +out:
> +	if (base)


* I suggest to omit such a pointer check because it was performed already
  directly after the of_iomap() call.

* Would it be nicer to use the label “unmap_io”?


> +		iounmap(base);
> +	return ret;
>  }
>  TIMER_OF_DECLARE(clps711x, "cirrus,ep7209-timer", clps711x_timer_init);
…

Regards,
Markus