ath9k: Remove bf_dmacontext.

The bf_dmacontext seems to be totally useless and duplicated
by bf_buf_addr.  Remove it entirely, use bf_buf_addr in its
place.
Signed-off-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath9k/ath9k.h

@@ -239,12 +239,11 @@ struct ath_buf {
 	struct sk_buff *bf_mpdu;	/* enclosing frame structure */
 	void *bf_desc;			/* virtual addr of desc */
 	dma_addr_t bf_daddr;		/* physical addr of desc */
-	dma_addr_t bf_buf_addr;		/* physical addr of data buffer */
+	dma_addr_t bf_buf_addr;	/* physical addr of data buffer, for DMA */
 	bool bf_stale;
 	bool bf_tx_aborted;
 	u16 bf_flags;
 	struct ath_buf_state bf_state;
-	dma_addr_t bf_dmacontext;
 	struct ath_wiphy *aphy;
 };
 

drivers/net/wireless/ath/ath9k/beacon.c

@@ -136,7 +136,7 @@ static struct ath_buf *ath_beacon_generate(struct ieee80211_hw *hw,
 	bf = avp->av_bcbuf;
 	skb = bf->bf_mpdu;
 	if (skb) {
-		dma_unmap_single(sc->dev, bf->bf_dmacontext,
+		dma_unmap_single(sc->dev, bf->bf_buf_addr,
 				 skb->len, DMA_TO_DEVICE);
 		dev_kfree_skb_any(skb);
 	}
@@ -162,9 +162,8 @@ static struct ath_buf *ath_beacon_generate(struct ieee80211_hw *hw,
 		hdr->seq_ctrl |= cpu_to_le16(sc->tx.seq_no);
 	}
 
-	bf->bf_buf_addr = bf->bf_dmacontext =
-		dma_map_single(sc->dev, skb->data,
-			       skb->len, DMA_TO_DEVICE);
+	bf->bf_buf_addr = dma_map_single(sc->dev, skb->data,
+					 skb->len, DMA_TO_DEVICE);
 	if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) {
 		dev_kfree_skb_any(skb);
 		bf->bf_mpdu = NULL;
@@ -252,7 +251,7 @@ int ath_beacon_alloc(struct ath_wiphy *aphy, struct ieee80211_vif *vif)
 	bf = avp->av_bcbuf;
 	if (bf->bf_mpdu != NULL) {
 		skb = bf->bf_mpdu;
-		dma_unmap_single(sc->dev, bf->bf_dmacontext,
+		dma_unmap_single(sc->dev, bf->bf_buf_addr,
 				 skb->len, DMA_TO_DEVICE);
 		dev_kfree_skb_any(skb);
 		bf->bf_mpdu = NULL;
@@ -296,9 +295,8 @@ int ath_beacon_alloc(struct ath_wiphy *aphy, struct ieee80211_vif *vif)
 		avp->tsf_adjust = cpu_to_le64(0);
 
 	bf->bf_mpdu = skb;
-	bf->bf_buf_addr = bf->bf_dmacontext =
-		dma_map_single(sc->dev, skb->data,
-			       skb->len, DMA_TO_DEVICE);
+	bf->bf_buf_addr = dma_map_single(sc->dev, skb->data,
+					 skb->len, DMA_TO_DEVICE);
 	if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) {
 		dev_kfree_skb_any(skb);
 		bf->bf_mpdu = NULL;
@@ -324,7 +322,7 @@ void ath_beacon_return(struct ath_softc *sc, struct ath_vif *avp)
 		bf = avp->av_bcbuf;
 		if (bf->bf_mpdu != NULL) {
 			struct sk_buff *skb = bf->bf_mpdu;
-			dma_unmap_single(sc->dev, bf->bf_dmacontext,
+			dma_unmap_single(sc->dev, bf->bf_buf_addr,
 					 skb->len, DMA_TO_DEVICE);
 			dev_kfree_skb_any(skb);
 			bf->bf_mpdu = NULL;

drivers/net/wireless/ath/ath9k/recv.c

@@ -363,7 +363,6 @@ int ath_rx_init(struct ath_softc *sc, int nbufs)
 				error = -ENOMEM;
 				goto err;
 			}
-			bf->bf_dmacontext = bf->bf_buf_addr;
 		}
 		sc->rx.rxlink = NULL;
 	}
@@ -1739,7 +1738,6 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp)
 			ath_rx_send_to_mac80211(hw, sc, skb, rxs);
 			break;
 		}
-		bf->bf_dmacontext = bf->bf_buf_addr;
 
 		/*
 		 * change the default rx antenna if rx diversity chooses the

drivers/net/wireless/ath/ath9k/xmit.c

@@ -294,7 +294,6 @@ static struct ath_buf* ath_clone_txbuf(struct ath_softc *sc, struct ath_buf *bf)
 	tbf->bf_buf_addr = bf->bf_buf_addr;
 	memcpy(tbf->bf_desc, bf->bf_desc, sc->sc_ah->caps.tx_desc_len);
 	tbf->bf_state = bf->bf_state;
-	tbf->bf_dmacontext = bf->bf_dmacontext;
 
 	return tbf;
 }
@@ -1640,17 +1639,15 @@ static int ath_tx_setup_buffer(struct ieee80211_hw *hw, struct ath_buf *bf,
 
 	bf->bf_mpdu = skb;
 
-	bf->bf_dmacontext = dma_map_single(sc->dev, skb->data,
-					   skb->len, DMA_TO_DEVICE);
-	if (unlikely(dma_mapping_error(sc->dev, bf->bf_dmacontext))) {
+	bf->bf_buf_addr = dma_map_single(sc->dev, skb->data,
+					 skb->len, DMA_TO_DEVICE);
+	if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) {
 		bf->bf_mpdu = NULL;
 		ath_print(ath9k_hw_common(sc->sc_ah), ATH_DBG_FATAL,
 			  "dma_mapping_error() on TX\n");
 		return -ENOMEM;
 	}
 
-	bf->bf_buf_addr = bf->bf_dmacontext;
-
 	bf->bf_tx_aborted = false;
 
 	return 0;
@@ -1914,7 +1911,7 @@ static void ath_tx_complete_buf(struct ath_softc *sc, struct ath_buf *bf,
 			tx_flags |= ATH_TX_XRETRY;
 	}
 
-	dma_unmap_single(sc->dev, bf->bf_dmacontext, skb->len, DMA_TO_DEVICE);
+	dma_unmap_single(sc->dev, bf->bf_buf_addr, skb->len, DMA_TO_DEVICE);
 
 	if (bf->bf_state.bfs_paprd) {
 		if (time_after(jiffies,