linux-kernel - Re: [PATCH] sysfs: sysfs_update_group always fails and generates a WARNING CALL-trace

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Date:	Wed, 16 Jan 2013 15:40:34 +0800
From:	"yanyg02@...il.com" <yanyg02@...il.com>
To:	Greg KH <gregkh@...uxfoundation.org>
CC:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sysfs: sysfs_update_group always fails and generates
 a WARNING CALL-trace

Sorry. I'm a fresh. This is my first patch commit. And still now *mutt* 
does not configured properly.

I will study howto and commit patch again. Sorry.

-------------------
> On Wed, Jan 16, 2013 at 03:04:25PM +0800, yanyg wrote:
>> @sysfs_update_group@ always fails and borns a WARNING CALL-trace
>> if the group exists. BUT still now, no *reference* of this routine at all.
> I don't understand.
OK, sysfs routine @sysfs_update_group@ *never* works properly
>
>> >From fe40df7d716658a1fbdab79768628c81d4363428 Mon Sep 17 00:00:00 2001
>> From: yanyg <yanyg02@...il.com>
>> Date: Wed, 16 Jan 2013 11:25:15 +0800
>> Subject: [PATCH] sysfs-fixes:
>>
>> @sysfs_update_group@ always fail and generates WARNING CALL trace.
>> fix @internal_create_group@ to avoid it.
> Why did you embed the patch here, with the words above it?  I would have
> to edit it to apply it :(
>
> It's also not in a format I can apply (no signed-off-by: line.)
So sorry.
>
>> ---
>>   fs/sysfs/group.c |   14 ++++++++++----
>>   1 files changed, 10 insertions(+), 4 deletions(-)
>>
>> diff --git a/fs/sysfs/group.c b/fs/sysfs/group.c
>> index 2df555c..51fcf62 100644
>> --- a/fs/sysfs/group.c
>> +++ b/fs/sysfs/group.c
>> @@ -60,7 +60,7 @@ static int internal_create_group(struct kobject *kobj, int update,
>>   				 const struct attribute_group *grp)
>>   {
>>   	struct sysfs_dirent *sd;
>> -	int error;
>> +	int error, do_put = 0;
>>   
>>   	BUG_ON(!kobj || (!update && !kobj->sd));
>>   
>> @@ -73,9 +73,14 @@ static int internal_create_group(struct kobject *kobj, int update,
>>   		return -EINVAL;
>>   	}
>>   	if (grp->name) {
>> -		error = sysfs_create_subdir(kobj, grp->name, &sd);
>> -		if (error)
>> -			return error;
>> +		sd = sysfs_get_dirent(kobj->sd, NULL, grp->name);
>> +		if (sd) {
>> +			do_put = 1;
>> +		} else {
>> +			error = sysfs_create_subdir(kobj, grp->name, &sd);
>> +			if (error)
>> +				return error;
>> +		}
>>   	} else
>>   		sd = kobj->sd;
>>   	sysfs_get(sd);
>> @@ -85,6 +90,7 @@ static int internal_create_group(struct kobject *kobj, int update,
>>   			sysfs_remove_subdir(sd);
>>   	}
>>   	sysfs_put(sd);
>> +	if (do_put) sysfs_put(sd);
> Always run your patches through scripts/checkpatch.pl and fix the
> problems it tells you about.
>
> What code in the kernel is hitting this today?
I write a simply virtual block device driver which calls 
@sysfs_update_group@ to updates attributes and modes, it fails.
YOU can reproduce the bug by append @sysfs_update_group@ at below any of 
@sysfs_create_group@ call.
>
> thanks,
>
> greg k-h
>

So too sorry for my silly.

yanyg02
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