netdev - Re: [PATCH net-next-2.6] mac80211: Speedup ieee80211_remove

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Date:	Thu, 05 Nov 2009 19:40:07 +0100
From:	Johannes Berg <johannes@...solutions.net>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Linux Netdev List <netdev@...r.kernel.org>,
	"John W. Linville" <linville@...driver.com>
Subject: Re: [PATCH net-next-2.6] mac80211: Speedup
 ieee80211_remove_interfaces()

On Thu, 2009-11-05 at 11:06 +0100, Eric Dumazet wrote:
> Speedup ieee80211_remove_interfaces() by factorizing synchronize_rcu() calls

Jouni will be pleased for his testing... :)

Looks good to me. Nice simplification too.

Reviewed-by: Johannes Berg <johannes@...solutions.net>

johannes

> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
> ---
>  net/mac80211/iface.c |   14 +++++---------
>  1 files changed, 5 insertions(+), 9 deletions(-)
> 
> diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
> index 14f10eb..a445f50 100644
> --- a/net/mac80211/iface.c
> +++ b/net/mac80211/iface.c
> @@ -852,22 +852,18 @@ void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
>  void ieee80211_remove_interfaces(struct ieee80211_local *local)
>  {
>  	struct ieee80211_sub_if_data *sdata, *tmp;
> +	LIST_HEAD(unreg_list);
>  
>  	ASSERT_RTNL();
>  
> +	mutex_lock(&local->iflist_mtx);
>  	list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
> -		/*
> -		 * we cannot hold the iflist_mtx across unregister_netdevice,
> -		 * but we only need to hold it for list modifications to lock
> -		 * out readers since we're under the RTNL here as all other
> -		 * writers.
> -		 */
> -		mutex_lock(&local->iflist_mtx);
>  		list_del(&sdata->list);
> -		mutex_unlock(&local->iflist_mtx);
>  
> -		unregister_netdevice(sdata->dev);
> +		unregister_netdevice_queue(sdata->dev, &unreg_list);
>  	}
> +	mutex_unlock(&local->iflist_mtx);
> +	unregister_netdevice_many(&unreg_list);
>  }
>  
>  static u32 ieee80211_idle_off(struct ieee80211_local *local,
> 
> --
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