iwlwifi: use GFP_KERNEL to allocate Rx SKB memory

Previously we allocate Rx SKB with GFP_ATOMIC flag. This is because we need
to hold a spinlock to protect the two rx_used and rx_free lists operation
in the rxq.

	spin_lock();
	...
	element = rxq->rx_used.next;
	element->skb = alloc_skb(..., GFP_ATOMIC);
	list_del(element);
	list_add_tail(&element->list, &rxq->rx_free);
	...
	spin_unlock();

After spliting the rx_used delete and rx_free insert into two operations,
we don't require the skb allocation in an atomic context any more (the
function itself is scheduled in a workqueue).

	spin_lock();
	...
	element = rxq->rx_used.next;
	list_del(element);
	...
	spin_unlock();
	...
	element->skb = alloc_skb(..., GFP_KERNEL);
	...
	spin_lock()
	...
	list_add_tail(&element->list, &rxq->rx_free);
	...
	spin_unlock();

This patch should fix the "iwlagn: Can not allocate SKB buffers" warning
we see recently.

Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Acked-by: Tomas Winkler <tomas.winkler@intel.com>
Cc: stable@kernel.org
Signed-off-by: John W. Linville <linville@tuxdriver.com>

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

@@ -1110,16 +1110,6 @@ static void iwl_setup_rx_handlers(struct iwl_priv *priv)
 	priv->cfg->ops->lib->rx_handler_setup(priv);
 }
 
-/*
- * this should be called while priv->lock is locked
-*/
-static void __iwl_rx_replenish(struct iwl_priv *priv)
-{
-	iwl_rx_allocate(priv);
-	iwl_rx_queue_restock(priv);
-}
-
-
 /**
  * iwl_rx_handle - Main entry function for receiving responses from uCode
  *
@@ -1228,7 +1218,7 @@ void iwl_rx_handle(struct iwl_priv *priv)
 			count++;
 			if (count >= 8) {
 				priv->rxq.read = i;
-				__iwl_rx_replenish(priv);
+				iwl_rx_queue_restock(priv);
 				count = 0;
 			}
 		}

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

@@ -244,25 +244,31 @@ void iwl_rx_allocate(struct iwl_priv *priv)
 	struct list_head *element;
 	struct iwl_rx_mem_buffer *rxb;
 	unsigned long flags;
+
+	while (1) {
 		spin_lock_irqsave(&rxq->lock, flags);
-	while (!list_empty(&rxq->rx_used)) {
+
+		if (list_empty(&rxq->rx_used)) {
+			spin_unlock_irqrestore(&rxq->lock, flags);
+			return;
+		}
 		element = rxq->rx_used.next;
 		rxb = list_entry(element, struct iwl_rx_mem_buffer, list);
+		list_del(element);
+
+		spin_unlock_irqrestore(&rxq->lock, flags);
 
 		/* Alloc a new receive buffer */
 		rxb->skb = alloc_skb(priv->hw_params.rx_buf_size + 256,
-				__GFP_NOWARN | GFP_ATOMIC);
+				     GFP_KERNEL);
 		if (!rxb->skb) {
-			if (net_ratelimit())
 			printk(KERN_CRIT DRV_NAME
-				       ": Can not allocate SKB buffers\n");
+				   "Can not allocate SKB buffers\n");
 			/* We don't reschedule replenish work here -- we will
 			 * call the restock method and if it still needs
 			 * more buffers it will schedule replenish */
 			break;
 		}
-		priv->alloc_rxb_skb++;
-		list_del(element);
 
 		/* Get physical address of RB/SKB */
 		rxb->real_dma_addr = pci_map_single(
@@ -276,12 +282,15 @@ void iwl_rx_allocate(struct iwl_priv *priv)
 		rxb->aligned_dma_addr = ALIGN(rxb->real_dma_addr, 256);
 		skb_reserve(rxb->skb, rxb->aligned_dma_addr - rxb->real_dma_addr);
 
+		spin_lock_irqsave(&rxq->lock, flags);
+
 		list_add_tail(&rxb->list, &rxq->rx_free);
 		rxq->free_count++;
-	}
+		priv->alloc_rxb_skb++;
+
 		spin_unlock_irqrestore(&rxq->lock, flags);
+	}
 }
-EXPORT_SYMBOL(iwl_rx_allocate);
 
 void iwl_rx_replenish(struct iwl_priv *priv)
 {