Merge branch 'linus' into x86/spinlocks

Done to prevent this failure of an Octopus merge:

 Added arch/arm/include/asm/byteorder.h in both, but differently.
 ERROR: Merge conflict in arch/arm/include/asm/byteorder.h
 Auto-merging include/asm-x86/spinlock.h
 ERROR: Merge conflict in include/asm-x86/spinlock.h
 fatal: merge program failed

1 files changed, 114 insertions, 22 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2x00queue.c b/drivers/net/wireless/rt2x00/rt2x00queue.c
index 898cdd7f57d..1676ac48479 100644
--- a/drivers/net/wireless/rt2x00/rt2x00queue.c
+++ b/drivers/net/wireless/rt2x00/rt2x00queue.c
@@ -33,10 +33,11 @@
 struct sk_buff *rt2x00queue_alloc_rxskb(struct rt2x00_dev *rt2x00dev,
 					struct queue_entry *entry)
 {
-	unsigned int frame_size;
-	unsigned int reserved_size;
 	struct sk_buff *skb;
 	struct skb_frame_desc *skbdesc;
+	unsigned int frame_size;
+	unsigned int head_size = 0;
+	unsigned int tail_size = 0;
 
 	/*
 	 * The frame size includes descriptor size, because the
@@ -49,16 +50,32 @@ struct sk_buff *rt2x00queue_alloc_rxskb(struct rt2x00_dev *rt2x00dev,
 	 * this means we need at least 3 bytes for moving the frame
 	 * into the correct offset.
 	 */
-	reserved_size = 4;
+	head_size = 4;
+
+	/*
+	 * For IV/EIV/ICV assembly we must make sure there is
+	 * at least 8 bytes bytes available in headroom for IV/EIV
+	 * and 4 bytes for ICV data as tailroon.
+	 */
+#ifdef CONFIG_RT2X00_LIB_CRYPTO
+	if (test_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags)) {
+		head_size += 8;
+		tail_size += 4;
+	}
+#endif /* CONFIG_RT2X00_LIB_CRYPTO */
 
 	/*
 	 * Allocate skbuffer.
 	 */
-	skb = dev_alloc_skb(frame_size + reserved_size);
+	skb = dev_alloc_skb(frame_size + head_size + tail_size);
 	if (!skb)
 		return NULL;
 
-	skb_reserve(skb, reserved_size);
+	/*
+	 * Make sure we not have a frame with the requested bytes
+	 * available in the head and tail.
+	 */
+	skb_reserve(skb, head_size);
 	skb_put(skb, frame_size);
 
 	/*
@@ -83,8 +100,21 @@ void rt2x00queue_map_txskb(struct rt2x00_dev *rt2x00dev, struct sk_buff *skb)
 {
 	struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb);
 
-	skbdesc->skb_dma = dma_map_single(rt2x00dev->dev, skb->data, skb->len,
-					  DMA_TO_DEVICE);
+	/*
+	 * If device has requested headroom, we should make sure that
+	 * is also mapped to the DMA so it can be used for transfering
+	 * additional descriptor information to the hardware.
+	 */
+	skb_push(skb, rt2x00dev->hw->extra_tx_headroom);
+
+	skbdesc->skb_dma =
+	    dma_map_single(rt2x00dev->dev, skb->data, skb->len, DMA_TO_DEVICE);
+
+	/*
+	 * Restore data pointer to original location again.
+	 */
+	skb_pull(skb, rt2x00dev->hw->extra_tx_headroom);
+
 	skbdesc->flags |= SKBDESC_DMA_MAPPED_TX;
 }
 EXPORT_SYMBOL_GPL(rt2x00queue_map_txskb);
@@ -100,7 +130,12 @@ void rt2x00queue_unmap_skb(struct rt2x00_dev *rt2x00dev, struct sk_buff *skb)
 	}
 
 	if (skbdesc->flags & SKBDESC_DMA_MAPPED_TX) {
-		dma_unmap_single(rt2x00dev->dev, skbdesc->skb_dma, skb->len,
+		/*
+		 * Add headroom to the skb length, it has been removed
+		 * by the driver, but it was actually mapped to DMA.
+		 */
+		dma_unmap_single(rt2x00dev->dev, skbdesc->skb_dma,
+				 skb->len + rt2x00dev->hw->extra_tx_headroom,
 				 DMA_TO_DEVICE);
 		skbdesc->flags &= ~SKBDESC_DMA_MAPPED_TX;
 	}
@@ -120,7 +155,6 @@ static void rt2x00queue_create_tx_descriptor(struct queue_entry *entry,
 {
 	struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
 	struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
-	struct rt2x00_intf *intf = vif_to_intf(tx_info->control.vif);
 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)entry->skb->data;
 	struct ieee80211_rate *rate =
 	    ieee80211_get_tx_rate(rt2x00dev->hw, tx_info);
@@ -140,7 +174,7 @@ static void rt2x00queue_create_tx_descriptor(struct queue_entry *entry,
 	txdesc->cw_max = entry->queue->cw_max;
 	txdesc->aifs = entry->queue->aifs;
 
-	/* Data length should be extended with 4 bytes for CRC */
+	/* Data length + CRC + IV/EIV/ICV/MMIC (when using encryption) */
 	data_length = entry->skb->len + 4;
 
 	/*
@@ -149,6 +183,35 @@ static void rt2x00queue_create_tx_descriptor(struct queue_entry *entry,
 	if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK))
 		__set_bit(ENTRY_TXD_ACK, &txdesc->flags);
 
+#ifdef CONFIG_RT2X00_LIB_CRYPTO
+	if (test_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags) &&
+	    !entry->skb->do_not_encrypt) {
+		struct ieee80211_key_conf *hw_key = tx_info->control.hw_key;
+
+		__set_bit(ENTRY_TXD_ENCRYPT, &txdesc->flags);
+
+		txdesc->cipher = rt2x00crypto_key_to_cipher(hw_key);
+
+		if (hw_key->flags & IEEE80211_KEY_FLAG_PAIRWISE)
+			__set_bit(ENTRY_TXD_ENCRYPT_PAIRWISE, &txdesc->flags);
+
+		txdesc->key_idx = hw_key->hw_key_idx;
+		txdesc->iv_offset = ieee80211_get_hdrlen_from_skb(entry->skb);
+
+		/*
+		 * Extend frame length to include all encryption overhead
+		 * that will be added by the hardware.
+		 */
+		data_length += rt2x00crypto_tx_overhead(tx_info);
+
+		if (!(hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV))
+			__set_bit(ENTRY_TXD_ENCRYPT_IV, &txdesc->flags);
+
+		if (!(hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_MMIC))
+			__set_bit(ENTRY_TXD_ENCRYPT_MMIC, &txdesc->flags);
+	}
+#endif /* CONFIG_RT2X00_LIB_CRYPTO */
+
 	/*
 	 * Check if this is a RTS/CTS frame
 	 */
@@ -214,16 +277,22 @@ static void rt2x00queue_create_tx_descriptor(struct queue_entry *entry,
 	 * sequence counter given by mac80211.
 	 */
 	if (tx_info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
-		spin_lock_irqsave(&intf->seqlock, irqflags);
+		if (likely(tx_info->control.vif)) {
+			struct rt2x00_intf *intf;
 
-		if (test_bit(ENTRY_TXD_FIRST_FRAGMENT, &txdesc->flags))
-			intf->seqno += 0x10;
-		hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
-		hdr->seq_ctrl |= cpu_to_le16(intf->seqno);
+			intf = vif_to_intf(tx_info->control.vif);
 
-		spin_unlock_irqrestore(&intf->seqlock, irqflags);
+			spin_lock_irqsave(&intf->seqlock, irqflags);
 
-		__set_bit(ENTRY_TXD_GENERATE_SEQ, &txdesc->flags);
+			if (test_bit(ENTRY_TXD_FIRST_FRAGMENT, &txdesc->flags))
+				intf->seqno += 0x10;
+			hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
+			hdr->seq_ctrl |= cpu_to_le16(intf->seqno);
+
+			spin_unlock_irqrestore(&intf->seqlock, irqflags);
+
+			__set_bit(ENTRY_TXD_GENERATE_SEQ, &txdesc->flags);
+		}
 	}
 
 	/*
@@ -305,11 +374,12 @@ int rt2x00queue_write_tx_frame(struct data_queue *queue, struct sk_buff *skb)
 	struct queue_entry *entry = rt2x00queue_get_entry(queue, Q_INDEX);
 	struct txentry_desc txdesc;
 	struct skb_frame_desc *skbdesc;
+	unsigned int iv_len;
 
 	if (unlikely(rt2x00queue_full(queue)))
 		return -EINVAL;
 
-	if (__test_and_set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags)) {
+	if (test_and_set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags)) {
 		ERROR(queue->rt2x00dev,
 		      "Arrived at non-free entry in the non-full queue %d.\n"
 		      "Please file bug report to %s.\n",
@@ -326,21 +396,42 @@ int rt2x00queue_write_tx_frame(struct data_queue *queue, struct sk_buff *skb)
 	rt2x00queue_create_tx_descriptor(entry, &txdesc);
 
 	/*
-	 * skb->cb array is now ours and we are free to use it.
+	 * All information is retreived from the skb->cb array,
+	 * now we should claim ownership of the driver part of that
+	 * array.
 	 */
 	skbdesc = get_skb_frame_desc(entry->skb);
 	memset(skbdesc, 0, sizeof(*skbdesc));
 	skbdesc->entry = entry;
 
+	/*
+	 * When hardware encryption is supported, and this frame
+	 * is to be encrypted, we should strip the IV/EIV data from
+	 * the frame so we can provide it to the driver seperately.
+	 */
+	if (test_bit(ENTRY_TXD_ENCRYPT, &txdesc.flags) &&
+	    !test_bit(ENTRY_TXD_ENCRYPT_IV, &txdesc.flags) &&
+		(IEEE80211_SKB_CB(skb)->control.hw_key != NULL)) {
+		iv_len = IEEE80211_SKB_CB(skb)->control.hw_key->iv_len;
+		rt2x00crypto_tx_remove_iv(skb, iv_len);
+	}
+
+	/*
+	 * It could be possible that the queue was corrupted and this
+	 * call failed. Just drop the frame, we cannot rollback and pass
+	 * the frame to mac80211 because the skb->cb has now been tainted.
+	 */
 	if (unlikely(queue->rt2x00dev->ops->lib->write_tx_data(entry))) {
-		__clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
-		return -EIO;
+		clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
+		dev_kfree_skb_any(entry->skb);
+		entry->skb = NULL;
+		return 0;
 	}
 
 	if (test_bit(DRIVER_REQUIRE_DMA, &queue->rt2x00dev->flags))
 		rt2x00queue_map_txskb(queue->rt2x00dev, skb);
 
-	__set_bit(ENTRY_DATA_PENDING, &entry->flags);
+	set_bit(ENTRY_DATA_PENDING, &entry->flags);
 
 	rt2x00queue_index_inc(queue, Q_INDEX);
 	rt2x00queue_write_tx_descriptor(entry, &txdesc);
@@ -653,6 +744,7 @@ static void rt2x00queue_init(struct rt2x00_dev *rt2x00dev,
 
 	queue->rt2x00dev = rt2x00dev;
 	queue->qid = qid;
+	queue->txop = 0;
 	queue->aifs = 2;
 	queue->cw_min = 5;
 	queue->cw_max = 10;