linux-kernel - Re: [PATCH -v3 5/8] fsnotify: unified filesystem notification backend

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Message-Id: <1227802471.4454.1754.camel@twins>
Date:	Thu, 27 Nov 2008 17:14:31 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Eric Paris <eparis@...hat.com>
Cc:	linux-kernel@...r.kernel.org, malware-list@...ts.printk.net,
	viro@...iv.linux.org.uk, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, arjan@...radead.org, hch@...radead.org
Subject: Re: [PATCH -v3 5/8] fsnotify: unified filesystem notification
 backend

On Tue, 2008-11-25 at 12:21 -0500, Eric Paris wrote:
> +
> +void fsnotify_put_group(struct fsnotify_group *group)
> +{
> +       mutex_lock(&fsnotify_grp_mutex);
> +       if (atomic_dec_and_test(&group->refcnt)) {
> +               list_del_rcu(&group->group_list);
> +               mutex_unlock(&fsnotify_grp_mutex);
> +
> +               synchronize_srcu(&fsnotify_grp_srcu_struct);
> +
> +               fsnotify_recalc_global_mask();
> +               fsnotify_kill_group(group);
> +
> +               return;
> +       }
> +       mutex_unlock(&fsnotify_grp_mutex);
> +
> +       return;
> +}

do you really need that mutex in the ! case?

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