linux-kernel - Re: [PATCH] usb: dwc3: meson-g12a: Disable the regulator in the error handling path of the probe

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Date:   Tue, 1 Jun 2021 10:47:47 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     balbi@...nel.org, gregkh@...uxfoundation.org, khilman@...libre.com,
        jbrunet@...libre.com, linux-usb@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] usb: dwc3: meson-g12a: Disable the regulator in the error
 handling path of the probe

On 23/05/2021 18:03, Martin Blumenstingl wrote:
> Hi Christophe,
> 
> On Fri, May 21, 2021 at 6:55 PM Christophe JAILLET
> <christophe.jaillet@...adoo.fr> wrote:
>>
>> If an error occurs after a successful 'regulator_enable()' call,
>> 'regulator_disable()' must be called.
>>
>> Fix the error handling path of the probe accordingly.
>>
>> The remove function doesn't need to be fixed, because the
>> 'regulator_disable()' call is already hidden in 'dwc3_meson_g12a_suspend()'
>> which is called via 'pm_runtime_set_suspended()' in the remove function.
>>
>> Fixes: c99993376f72 ("usb: dwc3: Add Amlogic G12A DWC3 glue")
>> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> for me this makes sense so:
> Reviewed-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>

Acked-by: Neil Armstrong <narmstrong@...libre.com>

> 
>> ---
>> Please review carefully.
>>
>> I'm not that sure about:
>>    The remove function doesn't need to be fixed, because the
>>    'regulator_disable()' call is already hidden in 'dwc3_meson_g12a_suspend()'
>>    which is called via 'pm_runtime_set_suspended()' in the remove function.
>>
>> This is more a guess than anything else!
> I am not 100% sure about the suspend code-path, so I am hoping that
> someone else (for example Neil) can also review your patch

Not 100% sure aswell, but the probe function is wrong anyway and must be fixed by this patch, so LGTM.

Neil

> 
> 
> Best regards,
> Martin
>