rt2x00: Use GFP_KERNEL for rx buffer allocation on USB devices

Since the RX path on USB devices is handled in process context we can
use GFP_KERNEL for RX buffer allocation. This should reduce the
likelihood of allocation failures.

Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
Acked-by: Gertjan van Wingerde <gwingerde@gmail.com>
Tested-By: Marc Dietrich <marvin24@gmx.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rt2x00/rt2x00.h

@@ -1282,7 +1282,7 @@ void rt2x00lib_dmadone(struct queue_entry *entry);
 void rt2x00lib_txdone(struct queue_entry *entry,
 		      struct txdone_entry_desc *txdesc);
 void rt2x00lib_txdone_noinfo(struct queue_entry *entry, u32 status);
-void rt2x00lib_rxdone(struct queue_entry *entry);
+void rt2x00lib_rxdone(struct queue_entry *entry, gfp_t gfp);
 
 /*
  * mac80211 handlers.

drivers/net/wireless/rt2x00/rt2x00dev.c

@@ -588,7 +588,7 @@ static int rt2x00lib_rxdone_read_signal(struct rt2x00_dev *rt2x00dev,
 	return 0;
 }
 
-void rt2x00lib_rxdone(struct queue_entry *entry)
+void rt2x00lib_rxdone(struct queue_entry *entry, gfp_t gfp)
 {
 	struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 	struct rxdone_entry_desc rxdesc;
@@ -608,7 +608,7 @@ void rt2x00lib_rxdone(struct queue_entry *entry)
 	 * Allocate a new sk_buffer. If no new buffer available, drop the
 	 * received frame and reuse the existing buffer.
 	 */
-	skb = rt2x00queue_alloc_rxskb(entry);
+	skb = rt2x00queue_alloc_rxskb(entry, gfp);
 	if (!skb)
 		goto submit_entry;
 

drivers/net/wireless/rt2x00/rt2x00lib.h

@@ -103,7 +103,7 @@ void rt2x00lib_config(struct rt2x00_dev *rt2x00dev,
  * rt2x00queue_alloc_rxskb - allocate a skb for RX purposes.
  * @entry: The entry for which the skb will be applicable.
  */
-struct sk_buff *rt2x00queue_alloc_rxskb(struct queue_entry *entry);
+struct sk_buff *rt2x00queue_alloc_rxskb(struct queue_entry *entry, gfp_t gfp);
 
 /**
  * rt2x00queue_free_skb - free a skb

drivers/net/wireless/rt2x00/rt2x00pci.c

@@ -92,7 +92,7 @@ bool rt2x00pci_rxdone(struct rt2x00_dev *rt2x00dev)
 		/*
 		 * Send the frame to rt2x00lib for further processing.
 		 */
-		rt2x00lib_rxdone(entry);
+		rt2x00lib_rxdone(entry, GFP_ATOMIC);
 	}
 
 	return !max_rx;

drivers/net/wireless/rt2x00/rt2x00queue.c

@@ -33,7 +33,7 @@
 #include "rt2x00.h"
 #include "rt2x00lib.h"
 
-struct sk_buff *rt2x00queue_alloc_rxskb(struct queue_entry *entry)
+struct sk_buff *rt2x00queue_alloc_rxskb(struct queue_entry *entry, gfp_t gfp)
 {
 	struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 	struct sk_buff *skb;
@@ -68,7 +68,7 @@ struct sk_buff *rt2x00queue_alloc_rxskb(struct queue_entry *entry)
 	/*
 	 * Allocate skbuffer.
 	 */
-	skb = dev_alloc_skb(frame_size + head_size + tail_size);
+	skb = __dev_alloc_skb(frame_size + head_size + tail_size, gfp);
 	if (!skb)
 		return NULL;
 
@@ -1163,7 +1163,7 @@ static int rt2x00queue_alloc_rxskbs(struct data_queue *queue)
 	struct sk_buff *skb;
 
 	for (i = 0; i < queue->limit; i++) {
-		skb = rt2x00queue_alloc_rxskb(&queue->entries[i]);
+		skb = rt2x00queue_alloc_rxskb(&queue->entries[i], GFP_KERNEL);
 		if (!skb)
 			return -ENOMEM;
 		queue->entries[i].skb = skb;

drivers/net/wireless/rt2x00/rt2x00usb.c

@@ -358,7 +358,7 @@ static void rt2x00usb_work_rxdone(struct work_struct *work)
 		/*
 		 * Send the frame to rt2x00lib for further processing.
 		 */
-		rt2x00lib_rxdone(entry);
+		rt2x00lib_rxdone(entry, GFP_KERNEL);
 	}
 }