linux-kernel - Re: [PATCH v2 06/19] PM / devfreq: tegra: Fix missed error checking on devfreq initialization failure

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Message-ID: <c7bca00a-98a0-f3af-78a2-e006c50cd621@samsung.com>
Date:   Wed, 17 Apr 2019 10:01:27 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     Dmitry Osipenko <digetx@...il.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>
Cc:     linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org
Subject: Re: [PATCH v2 06/19] PM / devfreq: tegra: Fix missed error checking
 on devfreq initialization failure

Hi,

On 19. 4. 16. 오후 11:29, Dmitry Osipenko wrote:
> 16.04.2019 5:32, Chanwoo Choi пишет:
>> Hi,
>>
>> patch6/7/8/9 are for handling of exception handling in probe() function.
>> Actually, I'm not sure that there are special reason to split out
>> the patches. I think that you can squash patch6/7/8/9 to only one patch.
> 
> Indeed, I was rebasing and reordering patches multiple times and looks like there is no reason not to squash these patches now.
> 
>> Also, even if patch6/7/8/9 handle the exception handling in probe(),
>> the tegra_devfreq_probe() doesn't support the restoring sequence
>> when fail happen. I think that if you want to fix the fail case of probe(),
>> please add the restoring sequence about following function.
>> - clk_disable_unprepare()
>> - clk_notifier_unregister()
>> - dev_pm_opp_remove()
> 
> When all of 6/7/8/9 patches are applied, the clk_notifier_register() becomes the last invocation of the probe function and clk_enable() is kept at the first place of the probe order. Hence the sequence you're suggesting is already incorrect because error-unwinding order usually should be opposite to the probe order. It looks to me that the current final result of these patches is already correct.

You're right. When I replied it, I have not considered the order.
Sorry, it made you some confusion.

> 
> 


-- 
Best Regards,
Chanwoo Choi
Samsung Electronics