Subject: Re: [patch] powerpc: sysfs fix compiler warning

From: Michael Buesch <[email-masked]>
Date: Sat, 23 Jun 2007 11:46:54 +0200

On Friday 22 June 2007 19:48:53 Christian Krafft wrote:
> From: Christian Krafft <[email-masked]>
> 
> This patch fixes the following compiler warning:
> arch/powerpc/kernel/sysfs.c:385: warning: ignoring return value of
> `sysfs_create_group',
> 
> Signed-off-by: Christian Krafft <[email-masked]>
> 
> Index: linux-2.6.22-rc5/arch/powerpc/kernel/sysfs.c
> ===================================================================
> --- linux-2.6.22-rc5.orig/arch/powerpc/kernel/sysfs.c
> +++ linux-2.6.22-rc5/arch/powerpc/kernel/sysfs.c
> @@ -380,16 +380,23 @@ int cpu_add_sysdev_attr_group(struct att
>  {
>  	int cpu;
>  	struct sys_device *sysdev;
> +	int error;
>  
>  	mutex_lock(&cpu_mutex);
>  
>  	for_each_possible_cpu(cpu) {
>  		sysdev = get_cpu_sysdev(cpu);
> -		sysfs_create_group(&sysdev->kobj, attrs);
> +		error |= sysfs_create_group(&sysdev->kobj, attrs);

That is probably dangerous, if multiple sysfs_create_group fail
with different error codes. So it will wiggle the error codes
together.

>  	}
> +	if(error)
 {
> +		for_each_possible_cpu(cpu) {
> +			sysdev = get_cpu_sysdev(cpu);
> +			sysfs_remove_group(&sysdev->kobj, attrs);
> +		}
probably do something like
		error = -ENOENT;
 }
or some other error code here to fix it.
> +
>  	mutex_unlock(&cpu_mutex);
> -	return 0;
> +	return error;
>  }
>  EXPORT_SYMBOL_GPL(cpu_add_sysdev_attr_group);
>  
> 
> 

-- 
Greetings Michael.