linux-kernel - Re: [PATCH] Allow sysfs_remove_group() to be called on non-added groups

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Message-ID: <dc1166600710221902t1383ff88q421a17b1ff1382cd@mail.gmail.com>
Date:	Tue, 23 Oct 2007 12:02:39 +1000
From:	"Michael Ellerman" <michael@...erman.id.au>
To:	"Greg Kroah-Hartman" <greg@...ah.com>
Cc:	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Allow sysfs_remove_group() to be called on non-added groups

On 9/13/07, Michael Ellerman <michael@...erman.id.au> wrote:
> It would be nice to be able to do:
>
> for_each_thing(thing) {
>         error = sysfs_create_group(&thing->kobj, attrs);
>         if (error) {
>                 for_each_thing(thing)
>                         sysfs_remove_group(&thing->kobj, attrs);
>                 return error;
>         }
> }
>
> But there's a BUG_ON() in sysfs_remove_group() which hits if the attributes
> were never added.
>
> As discussed here ...
> http://ozlabs.org/pipermail/cbe-oss-dev/2007-July/002774.html
>
> .. we should just return in that case instead of BUG'ing.
>
> Signed-off-by: Michael Ellerman <michael@...erman.id.au>
> ---
>  fs/sysfs/group.c |    3 ++-
>  1 files changed, 2 insertions(+), 1 deletions(-)
>
> diff --git a/fs/sysfs/group.c b/fs/sysfs/group.c
> index f318b73..a256775 100644
> --- a/fs/sysfs/group.c
> +++ b/fs/sysfs/group.c
> @@ -73,7 +73,8 @@ void sysfs_remove_group(struct kobject * kobj,
>
>         if (grp->name) {
>                 sd = sysfs_get_dirent(dir_sd, grp->name);
> -               BUG_ON(!sd);
> +               if (!sd)
> +                       return;
>         } else
>                 sd = sysfs_get(dir_sd);
>
>

Hi Greg,

I didn't see this in your series, any objections? AFAICT it still applies.

cheers
-
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