linux-kernel - Re: [PATCH v2 1/2] serdev: do not generate modaliases for controllers

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Message-ID: <20180119110637.gfaxyla7jy3hu5kj@earth.universe>
Date:   Fri, 19 Jan 2018 12:06:37 +0100
From:   Sebastian Reichel <sre@...nel.org>
To:     Johan Hovold <johan@...nel.org>
Cc:     Rob Herring <robh@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Frédéric Danis 
        <frederic.danis.oss@...il.com>, Hans de Goede <hdegoede@...hat.com>
Subject: Re: [PATCH v2 1/2] serdev: do not generate modaliases for controllers

Hi,

On Tue, Jan 09, 2018 at 05:09:16PM +0100, Johan Hovold wrote:
> Serdev controllers are not bound to any drivers and it therefore makes
> no sense to generate modaliases for them.
> 
> This has already been fixed separately for ACPI controllers for which
> uevent errors were also being logged during probe due to the missing
> ACPI companions (from which ACPI modaliases are generated).
> 
> This patch moves the modalias handling from the bus type to the client
> device type. Specifically, this means that only serdev devices (a.k.a.
> clients or slaves) will have have MODALIAS fields in their uevent
> environments and corresponding modalias sysfs attributes.
> 
> Also add the missing static keyword for the modalias device attribute
> when moving the definition.
> 
> Reported-by: Hans de Goede <hdegoede@...hat.com>
> Signed-off-by: Johan Hovold <johan@...nel.org>
> ---

Reviewed-by: Sebastian Reichel <sebastian.reichel@...labora.co.uk>

-- Sebastian

>  drivers/tty/serdev/core.c | 72 ++++++++++++++++++++++-------------------------
>  1 file changed, 34 insertions(+), 38 deletions(-)
> 
> diff --git a/drivers/tty/serdev/core.c b/drivers/tty/serdev/core.c
> index 5dc88f61f506..c8c43834477b 100644
> --- a/drivers/tty/serdev/core.c
> +++ b/drivers/tty/serdev/core.c
> @@ -19,6 +19,38 @@
>  static bool is_registered;
>  static DEFINE_IDA(ctrl_ida);
>  
> +static ssize_t modalias_show(struct device *dev,
> +			     struct device_attribute *attr, char *buf)
> +{
> +	int len;
> +
> +	len = acpi_device_modalias(dev, buf, PAGE_SIZE - 1);
> +	if (len != -ENODEV)
> +		return len;
> +
> +	return of_device_modalias(dev, buf, PAGE_SIZE);
> +}
> +static DEVICE_ATTR_RO(modalias);
> +
> +static struct attribute *serdev_device_attrs[] = {
> +	&dev_attr_modalias.attr,
> +	NULL,
> +};
> +ATTRIBUTE_GROUPS(serdev_device);
> +
> +static int serdev_device_uevent(struct device *dev, struct kobj_uevent_env *env)
> +{
> +	int rc;
> +
> +	/* TODO: platform modalias */
> +
> +	rc = acpi_device_uevent_modalias(dev, env);
> +	if (rc != -ENODEV)
> +		return rc;
> +
> +	return of_device_uevent_modalias(dev, env);
> +}
> +
>  static void serdev_device_release(struct device *dev)
>  {
>  	struct serdev_device *serdev = to_serdev_device(dev);
> @@ -26,6 +58,8 @@ static void serdev_device_release(struct device *dev)
>  }
>  
>  static const struct device_type serdev_device_type = {
> +	.groups		= serdev_device_groups,
> +	.uevent		= serdev_device_uevent,
>  	.release	= serdev_device_release,
>  };
>  
> @@ -49,23 +83,6 @@ static int serdev_device_match(struct device *dev, struct device_driver *drv)
>  	return of_driver_match_device(dev, drv);
>  }
>  
> -static int serdev_uevent(struct device *dev, struct kobj_uevent_env *env)
> -{
> -	int rc;
> -
> -	/* TODO: platform modalias */
> -
> -	/* ACPI enumerated controllers do not have a modalias */
> -	if (!dev->of_node && dev->type == &serdev_ctrl_type)
> -		return 0;
> -
> -	rc = acpi_device_uevent_modalias(dev, env);
> -	if (rc != -ENODEV)
> -		return rc;
> -
> -	return of_device_uevent_modalias(dev, env);
> -}
> -
>  /**
>   * serdev_device_add() - add a device previously constructed via serdev_device_alloc()
>   * @serdev:	serdev_device to be added
> @@ -305,32 +322,11 @@ static int serdev_drv_remove(struct device *dev)
>  	return 0;
>  }
>  
> -static ssize_t modalias_show(struct device *dev,
> -			     struct device_attribute *attr, char *buf)
> -{
> -	int len;
> -
> -	len = acpi_device_modalias(dev, buf, PAGE_SIZE - 1);
> -	if (len != -ENODEV)
> -		return len;
> -
> -	return of_device_modalias(dev, buf, PAGE_SIZE);
> -}
> -DEVICE_ATTR_RO(modalias);
> -
> -static struct attribute *serdev_device_attrs[] = {
> -	&dev_attr_modalias.attr,
> -	NULL,
> -};
> -ATTRIBUTE_GROUPS(serdev_device);
> -
>  static struct bus_type serdev_bus_type = {
>  	.name		= "serial",
>  	.match		= serdev_device_match,
>  	.probe		= serdev_drv_probe,
>  	.remove		= serdev_drv_remove,
> -	.uevent		= serdev_uevent,
> -	.dev_groups	= serdev_device_groups,
>  };
>  
>  /**
> -- 
> 2.15.1
> 

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