iwlagn: remove rxb page bookkeeping

We never use the value in alloc_rxb_page,
so there's no point in keeping it either.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlwifi/iwl-agn-lib.c

@@ -912,7 +912,6 @@ void iwlagn_rx_allocate(struct iwl_priv *priv, gfp_t priority)
 
 		list_add_tail(&rxb->list, &rxq->rx_free);
 		rxq->free_count++;
-		priv->alloc_rxb_page++;
 
 		spin_unlock_irqrestore(&rxq->lock, flags);
 	}

drivers/net/wireless/iwlwifi/iwl-dev.h

@@ -1191,7 +1191,6 @@ struct iwl_priv {
 	int frames_count;
 
 	enum ieee80211_band band;
-	int alloc_rxb_page;
 
 	void (*rx_handlers[REPLY_MAX])(struct iwl_priv *priv,
 				       struct iwl_rx_mem_buffer *rxb);
@@ -1609,12 +1608,10 @@ static inline int is_channel_ibss(const struct iwl_channel_info *ch)
 static inline void __iwl_free_pages(struct iwl_priv *priv, struct page *page)
 {
 	__free_pages(page, priv->hw_params.rx_page_order);
-	priv->alloc_rxb_page--;
 }
 
 static inline void iwl_free_pages(struct iwl_priv *priv, unsigned long page)
 {
 	free_pages(page, priv->hw_params.rx_page_order);
-	priv->alloc_rxb_page--;
 }
 #endif				/* __iwl_dev_h__ */

drivers/net/wireless/iwlwifi/iwl-rx.c

@@ -898,7 +898,6 @@ static void iwl_pass_packet_to_mac80211(struct iwl_priv *priv,
 	memcpy(IEEE80211_SKB_RXCB(skb), stats, sizeof(*stats));
 
 	ieee80211_rx(priv->hw, skb);
-	priv->alloc_rxb_page--;
 	rxb->page = NULL;
 }