linux-kernel - Re: [PATCH 4/4] OF: introduce OF style 'modalias' support for platform bus.

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Date:	Wed, 15 Jan 2014 07:45:18 -0600
From:	Rob Herring <robherring2@...il.com>
To:	Zhang Rui <rui.zhang@...el.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-acpi@...r.kernel.org, linux-i2c@...r.kernel.org,
	linux-spi@...r.kernel.org, wsa@...-dreams.de,
	Mark Brown <broonie@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	rafael.j.wysocki@...el.com, Grant Likely <grant.likely@...aro.org>,
	Rob Herring <rob.herring@...xeda.com>,
	jarkko.nikula@...ux.intel.com, mika.westerberg@...ux.intel.com,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH 4/4] OF: introduce OF style 'modalias' support for
 platform bus.

On Tue, Jan 14, 2014 at 2:46 AM, Zhang Rui <rui.zhang@...el.com> wrote:
> Fix a problem that, the platform bus supports the OF style modalias
> in .uevent() call, but not in its device 'modalias' sysfs attribute.
>
> cc: devicetree@...r.kernel.org
> Signed-off-by: Zhang Rui <rui.zhang@...el.com>

Acked-by: Rob Herring <robh@...nel.org>

As there doesn't appear any dependency with the rest of this series, I
can take this.

One minor nit below.

> ---
>  drivers/base/platform.c   |    4 ++++
>  drivers/of/device.c       |    3 +++
>  include/linux/of_device.h |    6 ++++++
>  3 files changed, 13 insertions(+)
>
> diff --git a/drivers/base/platform.c b/drivers/base/platform.c
> index 2f4aea2..bc78848 100644
> --- a/drivers/base/platform.c
> +++ b/drivers/base/platform.c
> @@ -679,6 +679,10 @@ static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
>         struct platform_device  *pdev = to_platform_device(dev);
>         int len;
>
> +       len = of_device_get_modalias(dev, buf, PAGE_SIZE -1);
> +       if (len != -ENODEV)
> +               return len;
> +
>         len = acpi_device_modalias(dev, buf, PAGE_SIZE -1);
>         if (len != -ENODEV)
>                 return len;
> diff --git a/drivers/of/device.c b/drivers/of/device.c
> index f685e55..dafb973 100644
> --- a/drivers/of/device.c
> +++ b/drivers/of/device.c
> @@ -85,6 +85,9 @@ ssize_t of_device_get_modalias(struct device *dev, char *str, ssize_t len)
>         int cplen, i;
>         ssize_t tsize, csize, repend;
>
> +       if ((!dev) || (!dev->of_node))\

Don't need the parentheses here.

> +               return -ENODEV;
> +
>         /* Name & Type */
>         csize = snprintf(str, len, "of:N%sT%s", dev->of_node->name,
>                          dev->of_node->type);
> diff --git a/include/linux/of_device.h b/include/linux/of_device.h
> index 82ce324..8d7dd67 100644
> --- a/include/linux/of_device.h
> +++ b/include/linux/of_device.h
> @@ -64,6 +64,12 @@ static inline int of_driver_match_device(struct device *dev,
>  static inline void of_device_uevent(struct device *dev,
>                         struct kobj_uevent_env *env) { }
>
> +static inline int of_device_get_modalias(struct device *dev,
> +                                  char *str, ssize_t len)
> +{
> +       return -ENODEV;
> +}
> +
>  static inline int of_device_uevent_modalias(struct device *dev,
>                                    struct kobj_uevent_env *env)
>  {
> --
> 1.7.9.5
>
> --
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