linux-kernel - Re: [PATCH v9 05/17] ARM: tegra: Propagate error from tegra_idle_lp2

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Fri, 21 Feb 2020 20:21:41 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Michał Mirosław <mirq-linux@...e.qmqm.pl>,
        Jasper Korten <jja2000@...il.com>,
        David Heidelberg <david@...t.cz>,
        Peter Geis <pgwipeout@...il.com>, linux-pm@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v9 05/17] ARM: tegra: Propagate error from
 tegra_idle_lp2_last()

21.02.2020 18:16, Daniel Lezcano пишет:
> On Thu, Feb 13, 2020 at 02:51:22AM +0300, Dmitry Osipenko wrote:
>> Technically cpu_suspend() may fail and it's never good to lose information
>> about failure. For example things like cpuidle core could correctly sample
>> idling time in the case of failure.
>>
>> Acked-by: Peter De Schrijver <pdeschrijver@...dia.com>
>> Tested-by: Peter Geis <pgwipeout@...il.com>
>> Tested-by: Jasper Korten <jja2000@...il.com>
>> Tested-by: David Heidelberg <david@...t.cz>
>> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
>> ---
> 
> [ ... ]
> 
>>  	cpu_cluster_pm_enter();
>>  	suspend_cpu_complex();
>>  
>> -	cpu_suspend(PHYS_OFFSET - PAGE_OFFSET, &tegra_sleep_cpu);
>> +	err = cpu_suspend(PHYS_OFFSET - PAGE_OFFSET, &tegra_sleep_cpu);
>>  
>>  	/*
>>  	 * Resume L2 cache if it wasn't re-enabled early during resume,
>> @@ -208,6 +210,8 @@ void tegra_idle_lp2_last(void)
>>  
>>  	restore_cpu_complex();
> 
> If the cpu_suspend fails, does restore_cpu_complex() need to be called ?

Yes, because suspend_cpu_complex() didn't fail. I don't see any reason
why restore_cpu_complex() shouldn't be called, please clarify yours thought.