netdev - Re: [PATCH net-next 4/6] netns: notify new nsid outside _

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Date:	Wed, 6 May 2015 13:48:32 +0200
From:	Thomas Graf <tgraf@...g.ch>
To:	Nicolas Dichtel <nicolas.dichtel@...nd.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net, ebiederm@...ssion.com
Subject: Re: [PATCH net-next 4/6] netns: notify new nsid outside
 __peernet2id()

On 05/06/15 at 11:58am, Nicolas Dichtel wrote:
> -static int __peernet2id(struct net *net, struct net *peer, bool alloc)
> +static int __peernet2id(struct net *net, struct net *peer, bool *alloc)
>  {
>  	int id = idr_for_each(&net->netns_ids, net_eq_idr, peer);
> +	bool alloc_it = *alloc;
>  
>  	ASSERT_RTNL();
>  
> +	*alloc = false;
> +
>  	/* Magic value for id 0. */
>  	if (id == NET_ID_ZERO)
>  		return 0;
>  	if (id > 0)
>  		return id;
>  
> -	if (alloc) {
> +	if (alloc_it) {
>  		id = alloc_netid(net, peer, -1);
> +		*alloc = true;
>  		return id >= 0 ? id : NETNSA_NSID_NOT_ASSIGNED;
>  	}
>  
>  	return NETNSA_NSID_NOT_ASSIGNED;
>  }

Since you need the allocation behaviour from one call site only it
might be cleaner to add a __peernet2id_alloc() which is used from
the old __peernet2id() so you can call __peernet2id_alloc() from
peernet2id_alloc() and avoid putting these ugly bool alloc = false
in all other call sites.

Otherwise this looks good.
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