linux-kernel - Re: [PATCH v2] kernel/params.c: add/modify failure processing code when sysfs_create

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Date:	Mon, 22 Jul 2013 10:41:58 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
CC:	khali@...ux-fr.org, David.Woodhouse@...el.com,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] kernel/params.c: add/modify failure processing code
 when sysfs_create_file() fails.

Hello Maintainers:

Please help check this patch, when you have time.

Thanks.

On 07/11/2013 12:06 PM, Chen Gang wrote:
> When sysfs_create_file() fails, need consider about it. And process it
> with BUG_ON(), because sysfs_create_file() can fail due to OOM (not at
> boot) or name duplication (not here).
> 
> Also correct the error printing information when failure occurs.
> 
> Signed-off-by: Chen Gang <gang.chen@...anux.com>
> ---
>  kernel/params.c |    7 +++++--
>  1 files changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/params.c b/kernel/params.c
> index 440e65d..3d70f90 100644
> --- a/kernel/params.c
> +++ b/kernel/params.c
> @@ -745,12 +745,14 @@ static struct module_kobject * __init locate_module_kobject(const char *name)
>  		err = kobject_init_and_add(&mk->kobj, &module_ktype, NULL,
>  					   "%s", name);
>  #ifdef CONFIG_MODULES
> -		if (!err)
> +		if (!err) {
>  			err = sysfs_create_file(&mk->kobj, &module_uevent.attr);
> +			BUG_ON(err);
> +		}
>  #endif
>  		if (err) {
>  			kobject_put(&mk->kobj);
> -			pr_crit("Adding module '%s' to sysfs failed (%d), the system may be unstable.\n",
> +			pr_crit("Initializing and adding module '%s' failed (%d), the system may be unstable.\n",
>  				name, err);
>  			return NULL;
>  		}
> @@ -845,6 +847,7 @@ 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);
> +			BUG_ON(err);
>  			kobject_uevent(&mk->kobj, KOBJ_ADD);
>  			kobject_put(&mk->kobj);
>  		}
> 


-- 
Chen Gang
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