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

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Date:	Mon, 17 Jan 2011 19:21:00 +0100 (CET)
From:	Lukas Czerner <lczerner@...hat.com>
To:	Eric Sandeen <sandeen@...hat.com>
cc:	Lukas Czerner <lczerner@...hat.com>, linux-ext4@...r.kernel.org,
	tytso@....edu
Subject: Re: [PATCH] ext4: Unregister features interface on module unload

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 ?

-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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