linux-kernel - Re: [PATCH mvebu v3 07/10] cpufreq: armada-37xx: Fix driver cleanup when registration failed

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Date:   Mon, 29 Mar 2021 16:58:11 +0200
From:   Gregory CLEMENT <gregory.clement@...tlin.com>
To:     Pali Rohár <pali@...nel.org>,
        Andrew Lunn <andrew@...n.ch>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org
Cc:     Marek Behún <kabel@...nel.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Tomasz Maciej Nowak <tmn505@...il.com>,
        Luka Perkov <luka.perkov@...tura.hr>,
        Andre Heider <a.heider@...il.com>,
        Vladimir Vid <vladimir.vid@...tura.hr>,
        Russell King <rmk+kernel@...linux.org.uk>,
        Gérald Kerma <gerald@....net>,
        Konstantin Porotchkin <kostap@...vell.com>
Subject: Re: [PATCH mvebu v3 07/10] cpufreq: armada-37xx: Fix driver cleanup
 when registration failed

Pali Rohár <pali@...nel.org> writes:

> Commit 8db82563451f ("cpufreq: armada-37xx: fix frequency calculation for
> opp") changed calculation of frequency passed to the dev_pm_opp_add()
> function call. But the code for dev_pm_opp_remove() function call was not
> updated, so the driver cleanup phase does not work when registration fails.
>
> This fixes the issue by using the same frequency in both calls.
>
> Signed-off-by: Pali Rohár <pali@...nel.org>
> Tested-by: Tomasz Maciej Nowak <tmn505@...il.com>
> Tested-by: Anders Trier Olesen <anders.trier.olesen@...il.com>
> Tested-by: Philip Soares <philips@...isense.com>
> Fixes: 8db82563451f ("cpufreq: armada-37xx: fix frequency calculation for opp")
> Cc: stable@...r.kernel.org

Acked-by: Gregory CLEMENT <gregory.clement@...tlin.com>

Thanks,

Gregory
> ---
>  drivers/cpufreq/armada-37xx-cpufreq.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/cpufreq/armada-37xx-cpufreq.c b/drivers/cpufreq/armada-37xx-cpufreq.c
> index c7683d447b11..1ab2113daef5 100644
> --- a/drivers/cpufreq/armada-37xx-cpufreq.c
> +++ b/drivers/cpufreq/armada-37xx-cpufreq.c
> @@ -521,7 +521,7 @@ static int __init armada37xx_cpufreq_driver_init(void)
>  remove_opp:
>  	/* clean-up the already added opp before leaving */
>  	while (load_lvl-- > ARMADA_37XX_DVFS_LOAD_0) {
> -		freq = cur_frequency / dvfs->divider[load_lvl];
> +		freq = base_frequency / dvfs->divider[load_lvl];
>  		dev_pm_opp_remove(cpu_dev, freq);
>  	}
>  
> -- 
> 2.20.1
>

-- 
Gregory Clement, Bootlin
Embedded Linux and Kernel engineering
http://bootlin.com