linux-kernel - Re: [PATCH] clocksource/drivers: Fix memory leak in ttc_setup

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Message-ID: <fb5d5331-9a89-8370-1e61-396dd05f291a@web.de>
Date:   Tue, 22 Oct 2019 10:26:41 +0200
From:   Markus Elfring <Markus.Elfring@....de>
To:     Navid Emamdoost <navid.emamdoost@...il.com>,
        linux-arm-kernel@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Navid Emamdoost <emamd001@....edu>, Kangjie Lu <kjlu@....edu>,
        Stephen McCamant <smccaman@....edu>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Michal Simek <michal.simek@...inx.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] clocksource/drivers: Fix memory leak in
 ttc_setup_clockevent

> In the impelementation of ttc_setup_clockevent() the allocated memory
> for ttcce should be released if clk_notifier_register() fails.

* Please avoid the copying of typos from previous change descriptions.

* Under which circumstances will an “imperative mood” matter for you here?
  https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?id=7d194c2100ad2a6dded545887d02754948ca5241#n151

> +++ b/drivers/clocksource/timer-cadence-ttc.c
> @@ -424,6 +424,7 @@ static int __init ttc_setup_clockevent(struct clk *clk,
>  				    &ttcce->ttc.clk_rate_change_nb);
>  	if (err) {
>  		pr_warn("Unable to register clock notifier.\n");
> +		kfree(ttcce);
>  		return err;
>  	}

This addition looks correct.
But I would prefer to move such exception handling code to the end of
this function implementation so that duplicate source code will be reduced.
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/coding-style.rst?id=7d194c2100ad2a6dded545887d02754948ca5241#n450

Regards,
Markus