linux-ext4 - Re: [PATCH] ext4: Unregister features interface on module unload

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Date:	Mon, 17 Jan 2011 12:40:00 -0600
From:	Eric Sandeen <sandeen@...hat.com>
To:	Lukas Czerner <lczerner@...hat.com>
CC:	linux-ext4@...r.kernel.org, tytso@....edu
Subject: Re: [PATCH] ext4: Unregister features interface on module unload

On 01/17/2011 12:21 PM, Lukas Czerner wrote:
> On Mon, 17 Jan 2011, Eric Sandeen wrote:
> 
>> On 01/17/2011 09:00 AM, Lukas Czerner wrote:
>>> Ext4 features interface was not properly unregistered which led to
>>> problems while unloading/reloading ext4 module. This commit fixes that by
>>> adding proper kobject unregistration code into ext4_exit_fs() as well as
>>> fail-path of ext4_init_fs()
>>>
>>> Signed-off-by: Lukas Czerner <lczerner@...hat.com>
>>> Reported-by: Eric Sandeen <sandeen@...hat.com>
>>
>> Works for me!
>>
>> Tested-by: Eric Sandeen <sandeen@...hat.com>
>>
>> Thanks - probably needs to go to .37-stable too right?
> 
> Definitely, should I send it somewhere else then ?

Once it's upstream, send the upstream commit details to
stable@...nel.org, and which 2.6.3X.Y tree(s) it should apply to.

-Eric

> -Lukas
> 
>>
>> -Eric
>>
>>> ---
>>>  fs/ext4/super.c |   12 ++++++++++--
>>>  1 files changed, 10 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
>>> index cb10a06..124d304 100644
>>> --- a/fs/ext4/super.c
>>> +++ b/fs/ext4/super.c
>>> @@ -4779,7 +4779,7 @@ static struct file_system_type ext4_fs_type = {
>>>  	.fs_flags	= FS_REQUIRES_DEV,
>>>  };
>>>  
>>> -int __init ext4_init_feat_adverts(void)
>>> +static int __init ext4_init_feat_adverts(void)
>>>  {
>>>  	struct ext4_features *ef;
>>>  	int ret = -ENOMEM;
>>> @@ -4803,6 +4803,13 @@ out:
>>>  	return ret;
>>>  }
>>>  
>>> +static void ext4_exit_feat_adverts(void)
>>> +{
>>> +	kobject_put(&ext4_feat->f_kobj);
>>> +	wait_for_completion(&ext4_feat->f_kobj_unregister);
>>> +	kfree(ext4_feat);
>>> +}
>>> +
>>>  static int __init ext4_init_fs(void)
>>>  {
>>>  	int err;
>>> @@ -4849,7 +4856,7 @@ out1:
>>>  out2:
>>>  	ext4_exit_mballoc();
>>>  out3:
>>> -	kfree(ext4_feat);
>>> +	ext4_exit_feat_adverts();
>>>  	remove_proc_entry("fs/ext4", NULL);
>>>  	kset_unregister(ext4_kset);
>>>  out4:
>>> @@ -4868,6 +4875,7 @@ static void __exit ext4_exit_fs(void)
>>>  	destroy_inodecache();
>>>  	ext4_exit_xattr();
>>>  	ext4_exit_mballoc();
>>> +	ext4_exit_feat_adverts();
>>>  	remove_proc_entry("fs/ext4", NULL);
>>>  	kset_unregister(ext4_kset);
>>>  	ext4_exit_system_zone();
>>
>>
> 

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