linux-kernel - Re: [PATCH] kernel/params.c: print failure information instead of 'KOBJ_ADD' to user space, when sysfs_create

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Date:	Tue, 09 Jul 2013 17:37:48 +0930
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Chen Gang <gang.chen@...anux.com>, khali@...ux-fr.org,
	David.Woodhouse@...el.com
Cc:	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kernel/params.c: print failure information instead of 'KOBJ_ADD' to user space, when sysfs_create_file() fails.

Chen Gang <gang.chen@...anux.com> writes:
> When sysfs_create_file() fails, recommend to print the related failure
> information. And it is useless to still 'KOBJ_ADD' to user space.
>
> Signed-off-by: Chen Gang <gang.chen@...anux.com>

sysfs_create_file() should not fail during boot, should it?

Cheers,
Rusty.

> ---
>  kernel/params.c |    8 +++++++-
>  1 files changed, 7 insertions(+), 1 deletions(-)
>
> diff --git a/kernel/params.c b/kernel/params.c
> index 440e65d..f5299c1 100644
> --- a/kernel/params.c
> +++ b/kernel/params.c
> @@ -845,7 +845,13 @@ static void __init version_sysfs_builtin(void)
>  		mk = locate_module_kobject(vattr->module_name);
>  		if (mk) {
>  			err = sysfs_create_file(&mk->kobj, &vattr->mattr.attr);
> -			kobject_uevent(&mk->kobj, KOBJ_ADD);
> +			if (err)
> +				printk(KERN_WARNING
> +				       "%s (%d): sysfs_create_file fail for %s, err: %d\n",
> +				       __FILE__, __LINE__,
> +				       vattr->module_name, err);
> +			else
> +				kobject_uevent(&mk->kobj, KOBJ_ADD);
>  			kobject_put(&mk->kobj);
>  		}
>  	}
> -- 
> 1.7.7.6
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