linux-kernel - Re: [PATCH 4/4] extcon: extcon-max8997: Fix IRQ freeing at error path

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Message-ID: <f5b5c30f-9a84-459e-d3c8-5a5760912cb1@canonical.com>
Date:   Tue, 11 May 2021 12:27:10 -0400
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     matti.vaittinen@...rohmeurope.com
Cc:     Chanwoo Choi <cw00.choi@...sung.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] extcon: extcon-max8997: Fix IRQ freeing at error path

On 10/05/2021 23:32, Matti Vaittinen wrote:
> Hi Krzysztof,
> 
> On Mon, 2021-05-10 at 10:21 -0400, Krzysztof Kozlowski wrote:
>> On 10/05/2021 04:12, Matti Vaittinen wrote:
>>> If reading MAX8997_MUIC_REG_STATUS1 fails at probe the driver exits
>>> without freeing the requested IRQs.
>>
>> The driver frees IRQ on probe failure, so maybe you meant missing IRQ
>> mapping dispose?
> 
> No. The commit 3e34c8198960 ("extcon: max8997: Avoid forcing UART path
> on drive probe") introduced a return w/o IRQ freeing if reading the
> MAX8997_MUIC_REG_STATUS1 fails at the end of the probe. This is not
> visible in the patch though - as the return is Ok after the IRQs and
> work-queue cancellation are managed by devm.

I see it now, right. The fix is big and changes too much to be
backportable. I would prefer to simply fix the problem with "goto
err_irq" and convert to devm in next patch.


Best regards,
Krzysztof