linux-kernel - Re: [PATCH] ASoC: wm8731: Disable the regulator when probing fails

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Date:   Wed, 6 Apr 2022 19:25:04 +0800
From:   Zheyu Ma <zheyuma97@...il.com>
To:     Charles Keepax <ckeepax@...nsource.cirrus.com>
Cc:     lgirdwood@...il.com, broonie@...nel.org, perex@...ex.cz,
        tiwai@...e.com, patches@...nsource.cirrus.com,
        alsa-devel@...a-project.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ASoC: wm8731: Disable the regulator when probing fails

Hi Charles,

On Wed, Apr 6, 2022 at 6:01 PM Charles Keepax
<ckeepax@...nsource.cirrus.com> wrote:
>
> On Tue, Apr 05, 2022 at 08:10:38PM +0800, Zheyu Ma wrote:
> > When the driver fails during probing, the driver should disable the
> > regulator, not just handle it in wm8731_hw_init().
> >
> > The following log reveals it:
> >
> > [   17.812483] WARNING: CPU: 1 PID: 364 at drivers/regulator/core.c:2257 _regulator_put+0x3ec/0x4e0
> > [   17.815958] RIP: 0010:_regulator_put+0x3ec/0x4e0
> > [   17.824467] Call Trace:
> > [   17.824774]  <TASK>
> > [   17.825040]  regulator_bulk_free+0x82/0xe0
> > [   17.825514]  devres_release_group+0x319/0x3d0
> > [   17.825882]  i2c_device_probe+0x766/0x940
> > [   17.829198]  i2c_register_driver+0xb5/0x130
> >
> > Signed-off-by: Zheyu Ma <zheyuma97@...il.com>
> > ---
>
> Mark just merged a big chain overhauling a lot of this driver, at
> the very least this patch is going to require a rebase on top of
> that lot.

Thanks for your reminder, this bug has been fixed in the latest code.

Regards,
Zheyu Ma