linux-kernel - Re: [PATCH v4] iio: light: cm32181: Unregister second I2C client if present

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Message-ID: <20230226125555.32fe6a96@jic23-huawei>
Date:   Sun, 26 Feb 2023 12:55:55 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     Kai-Heng Feng <kai.heng.feng@...onical.com>, lars@...afoo.de,
        Kevin Tsai <ktsai@...ellamicro.com>, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] iio: light: cm32181: Unregister second I2C client if
 present

On Thu, 23 Feb 2023 09:41:29 +0100
Hans de Goede <hdegoede@...hat.com> wrote:

> Hi,
> 
> On 2/23/23 03:00, Kai-Heng Feng wrote:
> > If a second dummy client that talks to the actual I2C address was
> > created in probe(), there should be a proper cleanup on driver and
> > device removal to avoid leakage.
> > 
> > So unregister the dummy client via another callback.
> > 
> > Reviewed-by: Hans de Goede <hdegoede@...hat.com>
> > Suggested-by: Hans de Goede <hdegoede@...hat.com>
> > Fixes: c1e62062ff54 ("iio: light: cm32181: Handle CM3218 ACPI devices with 2 I2C resources")
> > Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2152281
> > Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>  
> 
> Thanks this patch looks good to me now, and you
> already added my Reviewed-by, so from my POV this
> is ready for merging now.
> 
Applied to the fixes-togreg branch of iio.git and marked for stable inclusion.

Thanks,

Jonathan

> Regards,
> 
> Hans
> 
> > ---
> > v4:
> >  - Remove logging kmalloc failures.
> > 
> > v3:
> >  - Use devm_add_action_or_reset() in a correct place.
> >  - Wording.
> > 
> > v2:
> >  - Use devm_add_action_or_reset() instead of remove() callback to avoid
> >    race.
> > 
> >  drivers/iio/light/cm32181.c | 12 ++++++++++++
> >  1 file changed, 12 insertions(+)
> > 
> > diff --git a/drivers/iio/light/cm32181.c b/drivers/iio/light/cm32181.c
> > index b1674a5bfa368..d4a34a3bf00d9 100644
> > --- a/drivers/iio/light/cm32181.c
> > +++ b/drivers/iio/light/cm32181.c
> > @@ -429,6 +429,14 @@ static const struct iio_info cm32181_info = {
> >  	.attrs			= &cm32181_attribute_group,
> >  };
> >  
> > +static void cm32181_unregister_dummy_client(void *data)
> > +{
> > +	struct i2c_client *client = data;
> > +
> > +	/* Unregister the dummy client */
> > +	i2c_unregister_device(client);
> > +}
> > +
> >  static int cm32181_probe(struct i2c_client *client)
> >  {
> >  	struct device *dev = &client->dev;
> > @@ -460,6 +468,10 @@ static int cm32181_probe(struct i2c_client *client)
> >  		client = i2c_acpi_new_device(dev, 1, &board_info);
> >  		if (IS_ERR(client))
> >  			return PTR_ERR(client);
> > +
> > +		ret = devm_add_action_or_reset(dev, cm32181_unregister_dummy_client, client);
> > +		if (ret)
> > +			return ret;
> >  	}
> >  
> >  	cm32181 = iio_priv(indio_dev);  
>