[lm-sensors] [PATCH 5/30] i2c: __must_check fixes, i2c-dev

[khali@linux-fr.org (Jean Delvare)]

> From: Jean Delvare <khali at linux-fr.org>
> 
> i2c: __must_check fixes (i2c-dev)
> 
> Check for error on sysfs file creation.
> Check for error on device creation.
> Delete sysfs file on device destruction.
> 
> I couldn't test this one beyond compilation, as it applies on top of
> another patch in Greg's tree [1] which breaks all my systems when I
> apply it (my udev isn't recent enough.) Anyone with bleeding edge udev
> is welcome to test and report.
> 
> [1] http://www.kernel.org/pub/linux/kernel/people/gregkh/gregkh-2.6/patches/i2c/i2c-dev-device.patch

For completeness, this comment no more applies thanks to a patch
reordering.

> Signed-off-by: Jean Delvare <khali at linux-fr.org>
> Signed-off-by: Greg Kroah-Hartman <gregkh at suse.de>
> ---
>  drivers/i2c/i2c-dev.c |   14 +++++++++++---
>  1 files changed, 11 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/i2c/i2c-dev.c b/drivers/i2c/i2c-dev.c
> index 2ce0833..567fb05 100644
> --- a/drivers/i2c/i2c-dev.c
> +++ b/drivers/i2c/i2c-dev.c
> @@ -406,6 +406,7 @@ static struct class *i2c_dev_class;
>  static int i2cdev_attach_adapter(struct i2c_adapter *adap)
>  {
>  	struct i2c_dev *i2c_dev;
> +	int res;
>  
>  	i2c_dev = get_free_i2c_dev(adap);
>  	if (IS_ERR(i2c_dev))
> @@ -419,14 +420,20 @@ static int i2cdev_attach_adapter(struct 
>  						 MKDEV(I2C_MAJOR, adap->nr),
>  						 &adap->dev, "i2c-%d",
>  						 adap->nr);
> -	if (!i2c_dev->class_dev)
> +	if (!i2c_dev->class_dev) {
> +		res = -ENODEV;
>  		goto error;
> -	class_device_create_file(i2c_dev->class_dev, &class_device_attr_name);
> +	}
> +	res = class_device_create_file(i2c_dev->class_dev, &class_device_attr_name);
> +	if (res)
> +		goto error_destroy;
>  	return 0;
> +error_destroy:
> +	class_device_destroy(i2c_dev_class, MKDEV(I2C_MAJOR, adap->nr));
>  error:
>  	return_i2c_dev(i2c_dev);
>  	kfree(i2c_dev);
> -	return -ENODEV;
> +	return res;
>  }
>  
>  static int i2cdev_detach_adapter(struct i2c_adapter *adap)
> @@ -437,6 +444,7 @@ static int i2cdev_detach_adapter(struct 
>  	if (!i2c_dev)
>  		return -ENODEV;
>  
> +	class_device_remove_file(i2c_dev->class_dev, &class_device_attr_name);
>  	return_i2c_dev(i2c_dev);
>  	class_device_destroy(i2c_dev_class, MKDEV(I2C_MAJOR, adap->nr));
>  	kfree(i2c_dev);
> -- 
> 1.4.2.1


-- 
Jean Delvare