Subject: Re: [PATCH v7 2/4] power: reset: add reboot mode driver
To: Andy Yan <andy.yan@rock-chips.com>, robh+dt@kernel.org, sre@kernel.org,
        heiko@sntech.de, john.stultz@linaro.org, arnd@arndb.de
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Cc: mark.rutland@arm.com, catalin.marinas@arm.com, will.deacon@arm.com,
        alexandre.belloni@free-electrons.com, f.fainelli@gmail.com,
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        linux-kernel@vger.kernel.org, galak@codeaurora.org, olof@lixom.net,
        jun.nie@linaro.org, dwmw2@infradead.org
From: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Message-id: <570CD983.9090202@samsung.com>
Date: Tue, 12 Apr 2016 13:18:27 +0200
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On 04/12/2016 11:27 AM, Andy Yan wrote:
>>>>> +
>>>>> +static const struct of_device_id syscon_reboot_mode_of_match[] = {
>>>>> +    { .compatible = "syscon-reboot-mode" },
>>>>> +    {}
>>>>> +};
>>>>> +
>>>>> +static struct platform_driver syscon_reboot_mode_driver = {
>>>>> +    .probe = syscon_reboot_mode_probe,
>>>> Cleanup needed. What will happen after device unbind? Memory will be
>>>> released (devm-*()) but reboot notifier won't thus leading to OOPS on
>>>> reboot.
>>>      From the kernel_restart_prepare function, the reboot notifier will
>>> be called before device_shutdown. Is there any other case the device
>>> unbind before reboot notifier
>>> called?
>> This is a regular module platform driver so unbind can happen any time
>> initiated by user, either by unbind command or by module removal. User
>> can then re-bind device or not - probably does not matter. Anyway after
>> such first unbind, the restart will kaboom instead of do a restart.
> 
>     I just need to do clean up in remove?

Yes, you need to clean up everything in remove() callback (in a reversed
order).

Best regards,
Krzysztof