linux-kernel - Re: [PATCH 6/7] tty: serial: samsung

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Date:   Mon, 11 Oct 2021 08:48:49 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Hector Martin <marcan@...can.st>,
        linux-arm-kernel@...ts.infradead.org
Cc:     Marc Zyngier <maz@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Arnd Bergmann <arnd@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mark Kettenis <mark.kettenis@...all.nl>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        devicetree@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
        linux-serial@...r.kernel.org
Subject: Re: [PATCH 6/7] tty: serial: samsung_tty: Support runtime PM

On 11/10/2021 07:32, Hector Martin wrote:
>>> +
>>>   		s3c24xx_serial_cpufreq_deregister(to_ourport(port));
>>>   		uart_remove_one_port(&s3c24xx_uart_drv, port);
>>> +
>>> +		pm_runtime_disable(&dev->dev);
>>
>> Why disabling it only if port!=NULL? Can remove() be called if
>> platform_set_drvdata() was not?
> 
> Good question, I'm not entirely sure why these code paths have a check 
> for NULL there. They were already there, do you happen to know why? To 
> me it sounds like remove would only be called if probe succeeds, at 
> which point drvdata should always be set.
> 

Exactly, anyway it is not part of your patch, so no problem.


Best regards,
Krzysztof