linux-kernel - Re: [RFC PATCH v2 05/10] i2c: add support for ACPI reconfigure notifications

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Date:	Fri, 22 Apr 2016 00:41:07 +0300
From:	Octavian Purdila <octavian.purdila@...el.com>
To:	Andy Shevchenko <andy.shevchenko@...il.com>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <lenb@...nel.org>,
	Matt Fleming <matt@...eblueprint.co.uk>,
	Mark Brown <broonie@...nel.org>,
	Wolfram Sang <wsa@...-dreams.de>,
	Joel Becker <jlbec@...lplan.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	linux-efi@...r.kernel.org, linux-i2c <linux-i2c@...r.kernel.org>,
	linux-spi <linux-spi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Irina Tirdea <irina.tirdea@...el.com>
Subject: Re: [RFC PATCH v2 05/10] i2c: add support for ACPI reconfigure notifications

On Fri, Apr 22, 2016 at 12:27 AM, Andy Shevchenko
<andy.shevchenko@...il.com> wrote:
>

Hi Andy and thanks for the review!

> On Wed, Apr 20, 2016 at 1:39 AM, Octavian Purdila
> <octavian.purdila@...el.com> wrote:
> > This patch adds supports for I2C device enumeration and removal via
> > ACPI reconfiguration notifications that are send as a result of an
> > ACPI table load or unload operation.
>
> >
> >         acpi_dev_free_resource_list(&resource_list);
> >
> > +       strlcpy(info->type, dev_name(&adev->dev), sizeof(info->type));
>
> strscpy() ?

That is the original code, I just moved it in a different function.
Its probably best if we use a separate patch for this, but is it worth
it?

>
> > +static int acpi_i2c_match_adapter(struct device *dev, void *data)
> > +{
> > +       struct i2c_adapter *adapter = i2c_verify_adapter(dev);
> > +
> > +       if (!adapter)
> > +               return 0;
> > +
>
> > +       return ACPI_HANDLE(dev) == (acpi_handle)data;
>
> What is suppose to return? Hidden bool to integer conversion is not
> best option I suppose.
>

per bus_find_device() :

 * The callback should return 0 if the device doesn't match and
non-zero
 * if it does.  If the callback returns non-zero, this function will
 * return to the caller and not iterate over any more devices.
 */
struct device *bus_find_device(struct bus_type *bus,
                               struct device *start, void *data,
                               int (*match)(struct device *dev, void *data))


> > +}
> > +
> > +static int acpi_i2c_match_device(struct device *dev, void *data)
> > +{
> > +       return ACPI_COMPANION(dev) == data;
>
> Ditto.
>
> > +}
>
> --
> With Best Regards,
> Andy Shevchenko