linux-kernel - Re: [PATCH] i2c: i2c-dev: Create 'name' attribute automatically

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Date:	Wed, 25 Sep 2013 22:20:35 +0200
From:	Wolfram Sang <wsa@...-dreams.de>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] i2c: i2c-dev: Create 'name' attribute automatically

On Sat, Aug 31, 2013 at 09:30:19AM -0700, Guenter Roeck wrote:
> The 'name' attribute is needed for all i2c-dev class devices, meaning
> it can be created automatically by pointing to it in the class data
> structure. This simplifies the code and reduces the probability for race
> conditions.

What race condition?

> 
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> ---
>  drivers/i2c/i2c-dev.c |   32 ++++++++++++++++----------------
>  1 file changed, 16 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/i2c/i2c-dev.c b/drivers/i2c/i2c-dev.c
> index c3ccdea..46eea02 100644
> --- a/drivers/i2c/i2c-dev.c
> +++ b/drivers/i2c/i2c-dev.c
> @@ -111,7 +111,11 @@ static ssize_t show_adapter_name(struct device *dev,
>  		return -ENODEV;
>  	return sprintf(buf, "%s\n", i2c_dev->adap->name);
>  }
> -static DEVICE_ATTR(name, S_IRUGO, show_adapter_name, NULL);
> +
> +static struct device_attribute i2c_dev_attributes[] = {
> +	__ATTR(name, S_IRUGO, show_adapter_name, NULL),
> +	{ }
> +};
>  
>  /* ------------------------------------------------------------------------- */
>  
> @@ -538,7 +542,11 @@ static const struct file_operations i2cdev_fops = {
>  
>  /* ------------------------------------------------------------------------- */
>  
> -static struct class *i2c_dev_class;
> +static struct class i2c_dev_class = {
> +	.owner = THIS_MODULE,
> +	.name = "i2c-dev",
> +	.dev_attrs = i2c_dev_attributes,
> +};

Have you tried this with two instances? I don't think it will work since
class_register modifies the class struct.

Regards,

   Wolfram


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