r8169: ensure tx_skb is fully reset after calling rtl8169_unmap_tx_skb

So far tx_skb->skb is the only member of the two structs that is not
reset. Make understanding the code easier by resetting both structs
completely in rtl8169_unmap_tx_skb.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index c0999ef..359f029 100644 (file)
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -3976,11 +3976,8 @@ static void rtl8169_unmap_tx_skb(struct device *d, struct ring_info *tx_skb,
        unsigned int len = tx_skb->len;
 
        dma_unmap_single(d, le64_to_cpu(desc->addr), len, DMA_TO_DEVICE);
-
-       desc->opts1 = 0x00;
-       desc->opts2 = 0x00;
-       desc->addr = 0x00;
-       tx_skb->len = 0;
+       memset(desc, 0, sizeof(*desc));
+       memset(tx_skb, 0, sizeof(*tx_skb));
 }
 
 static void rtl8169_tx_clear_range(struct rtl8169_private *tp, u32 start,
@@ -3998,10 +3995,8 @@ static void rtl8169_tx_clear_range(struct rtl8169_private *tp, u32 start,
 
                        rtl8169_unmap_tx_skb(tp_to_dev(tp), tx_skb,
                                             tp->TxDescArray + entry);
-                       if (skb) {
+                       if (skb)
                                dev_consume_skb_any(skb);
-                               tx_skb->skb = NULL;
-                       }
                }
        }
 }
@@ -4396,6 +4391,7 @@ static void rtl_tx(struct net_device *dev, struct rtl8169_private *tp,
        for (tx_left = tp->cur_tx - dirty_tx; tx_left > 0; tx_left--) {
                unsigned int entry = dirty_tx % NUM_TX_DESC;
                struct ring_info *tx_skb = tp->tx_skb + entry;
+               struct sk_buff *skb = tx_skb->skb;
                u32 status;
 
                status = le32_to_cpu(tp->TxDescArray[entry].opts1);
@@ -4410,11 +4406,10 @@ static void rtl_tx(struct net_device *dev, struct rtl8169_private *tp,
 
                rtl8169_unmap_tx_skb(tp_to_dev(tp), tx_skb,
                                     tp->TxDescArray + entry);
-               if (tx_skb->skb) {
+               if (skb) {
                        pkts_compl++;
-                       bytes_compl += tx_skb->skb->len;
-                       napi_consume_skb(tx_skb->skb, budget);
-                       tx_skb->skb = NULL;
+                       bytes_compl += skb->len;
+                       napi_consume_skb(skb, budget);
                }
                dirty_tx++;
        }