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:	Wed, 10 Jul 2013 10:17:10 +0800
From:	Chen Gang F T <chen.gang.flying.transformer@...il.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
CC:	Chen Gang <gang.chen@...anux.com>, khali@...ux-fr.org,
	David.Woodhouse@...el.com,
	"linux-kernel@...r.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.

On 07/09/2013 04:07 PM, Rusty Russell wrote:
> 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?
> 

Hmm..., please reference locate_module_kobject() in "kernel/params.c",
which is an '__init' function, and also call sysfs_create_file(), it
processes the related error.

So I recommend to get the check too in version_sysfs_builtin().

Thanks.

> 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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-- 
Chen Gang
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