linux-kernel - Re: [PATCH 5/9] rcu: Replace rcu_assign_pointer(x, NULL) with RCU_INIT

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Date:	Tue, 18 Mar 2014 16:30:49 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Monam Agarwal <monamagarwal123@...il.com>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	eddie.wai@...adcom.com
Subject: Re: [PATCH 5/9] rcu: Replace rcu_assign_pointer(x, NULL) with
 RCU_INIT_POINTER(x, NULL)

On Wed, Mar 19, 2014 at 04:16:42AM +0530, Monam Agarwal wrote:
> Signed-off-by: Monam Agarwal <monamagarwal123@...il.com>

Reviewed-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>

> ---
>  drivers/net/wireless/ath/carl9170/main.c |   12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/net/wireless/ath/carl9170/main.c b/drivers/net/wireless/ath/carl9170/main.c
> index f06e069..5518592 100644
> --- a/drivers/net/wireless/ath/carl9170/main.c
> +++ b/drivers/net/wireless/ath/carl9170/main.c
> @@ -446,7 +446,7 @@ static void carl9170_op_stop(struct ieee80211_hw *hw)
> 
>  	mutex_lock(&ar->mutex);
>  	if (IS_ACCEPTING_CMD(ar)) {
> -		rcu_assign_pointer(ar->beacon_iter, NULL);
> +		RCU_INIT_POINTER(ar->beacon_iter, NULL);
> 
>  		carl9170_led_set_state(ar, 0);
> 
> @@ -678,7 +678,7 @@ unlock:
>  		vif_priv->active = false;
>  		bitmap_release_region(&ar->vif_bitmap, vif_id, 0);
>  		ar->vifs--;
> -		rcu_assign_pointer(ar->vif_priv[vif_id].vif, NULL);
> +		RCU_INIT_POINTER(ar->vif_priv[vif_id].vif, NULL);
>  		list_del_rcu(&vif_priv->list);
>  		mutex_unlock(&ar->mutex);
>  		synchronize_rcu();
> @@ -716,7 +716,7 @@ static void carl9170_op_remove_interface(struct ieee80211_hw *hw,
>  	WARN_ON(vif_priv->enable_beacon);
>  	vif_priv->enable_beacon = false;
>  	list_del_rcu(&vif_priv->list);
> -	rcu_assign_pointer(ar->vif_priv[id].vif, NULL);
> +	RCU_INIT_POINTER(ar->vif_priv[id].vif, NULL);
> 
>  	if (vif == main_vif) {
>  		rcu_read_unlock();
> @@ -1258,7 +1258,7 @@ static int carl9170_op_sta_add(struct ieee80211_hw *hw,
>  		}
> 
>  		for (i = 0; i < CARL9170_NUM_TID; i++)
> -			rcu_assign_pointer(sta_info->agg[i], NULL);
> +			RCU_INIT_POINTER(sta_info->agg[i], NULL);
> 
>  		sta_info->ampdu_max_len = 1 << (3 + sta->ht_cap.ampdu_factor);
>  		sta_info->ht_sta = true;
> @@ -1285,7 +1285,7 @@ static int carl9170_op_sta_remove(struct ieee80211_hw *hw,
>  			struct carl9170_sta_tid *tid_info;
> 
>  			tid_info = rcu_dereference(sta_info->agg[i]);
> -			rcu_assign_pointer(sta_info->agg[i], NULL);
> +			RCU_INIT_POINTER(sta_info->agg[i], NULL);
> 
>  			if (!tid_info)
>  				continue;
> @@ -1398,7 +1398,7 @@ static int carl9170_op_ampdu_action(struct ieee80211_hw *hw,
>  			spin_unlock_bh(&ar->tx_ampdu_list_lock);
>  		}
> 
> -		rcu_assign_pointer(sta_info->agg[tid], NULL);
> +		RCU_INIT_POINTER(sta_info->agg[tid], NULL);
>  		rcu_read_unlock();
> 
>  		ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
> -- 
> 1.7.9.5
> 

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