linux-kernel - Re: [PATCH v4 2/9] devcg: reorder device exception functions

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Date:	Wed, 30 Jan 2013 19:44:48 +0000
From:	"Serge E. Hallyn" <serge@...lyn.com>
To:	aris@...hat.com
Cc:	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
	Tejun Heo <tj@...nel.org>,
	Serge Hallyn <serge.hallyn@...onical.com>
Subject: Re: [PATCH v4 2/9] devcg: reorder device exception functions

Quoting aris@...hat.com (aris@...hat.com):
> In preparation for the next patch, reorder dev_exception_add() and
> dev_exception_rm().
> 
> This patch doesn't introduce any functional changes.
> 
> Acked-by: Tejun Heo <tj@...nel.org>
> Cc: Tejun Heo <tj@...nel.org>
> Cc: Serge Hallyn <serge.hallyn@...onical.com>

Acked-by: Serge Hallyn <serge.hallyn@...onical.com>

> Signed-off-by: Aristeu Rozanski <aris@...hat.com>
> 
> ---
>  security/device_cgroup.c |   44 ++++++++++++++++++++++----------------------
>  1 file changed, 22 insertions(+), 22 deletions(-)
> 
> --- github.orig/security/device_cgroup.c	2013-01-29 11:49:14.739657516 -0500
> +++ github/security/device_cgroup.c	2013-01-29 11:49:14.987661210 -0500
> @@ -104,18 +104,14 @@ free_and_exit:
>  /*
>   * called under devcgroup_mutex
>   */
> -static int dev_exception_add(struct list_head *exceptions,
> +static void dev_exception_rm(struct list_head *exceptions,
>  			     struct dev_exception_item *ex)
>  {
> -	struct dev_exception_item *excopy, *walk;
> +	struct dev_exception_item *walk, *tmp;
>  
>  	lockdep_assert_held(&devcgroup_mutex);
>  
> -	excopy = kmemdup(ex, sizeof(*ex), GFP_KERNEL);
> -	if (!excopy)
> -		return -ENOMEM;
> -
> -	list_for_each_entry(walk, exceptions, list) {
> +	list_for_each_entry_safe(walk, tmp, exceptions, list) {
>  		if (walk->type != ex->type)
>  			continue;
>  		if (walk->major != ex->major)
> @@ -123,27 +119,29 @@ static int dev_exception_add(struct list
>  		if (walk->minor != ex->minor)
>  			continue;
>  
> -		walk->access |= ex->access;
> -		kfree(excopy);
> -		excopy = NULL;
> +		walk->access &= ~ex->access;
> +		if (!walk->access) {
> +			list_del_rcu(&walk->list);
> +			kfree_rcu(walk, rcu);
> +		}
>  	}
> -
> -	if (excopy != NULL)
> -		list_add_tail_rcu(&excopy->list, exceptions);
> -	return 0;
>  }
>  
>  /*
>   * called under devcgroup_mutex
>   */
> -static void dev_exception_rm(struct list_head *exceptions,
> +static int dev_exception_add(struct list_head *exceptions,
>  			     struct dev_exception_item *ex)
>  {
> -	struct dev_exception_item *walk, *tmp;
> +	struct dev_exception_item *excopy, *walk;
>  
>  	lockdep_assert_held(&devcgroup_mutex);
>  
> -	list_for_each_entry_safe(walk, tmp, exceptions, list) {
> +	excopy = kmemdup(ex, sizeof(*ex), GFP_KERNEL);
> +	if (!excopy)
> +		return -ENOMEM;
> +
> +	list_for_each_entry(walk, exceptions, list) {
>  		if (walk->type != ex->type)
>  			continue;
>  		if (walk->major != ex->major)
> @@ -151,12 +149,14 @@ static void dev_exception_rm(struct list
>  		if (walk->minor != ex->minor)
>  			continue;
>  
> -		walk->access &= ~ex->access;
> -		if (!walk->access) {
> -			list_del_rcu(&walk->list);
> -			kfree_rcu(walk, rcu);
> -		}
> +		walk->access |= ex->access;
> +		kfree(excopy);
> +		excopy = NULL;
>  	}
> +
> +	if (excopy != NULL)
> +		list_add_tail_rcu(&excopy->list, exceptions);
> +	return 0;
>  }
>  
>  static void __dev_exception_clean(struct dev_cgroup *dev_cgroup)
> 
> --
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