rtl8180: Add error check for pci_map_single return value in TX path

Orignal code will not detect a DMA mapping failure, causing the HW
to attempt a DMA from an invalid address.

This patch add the error check and eventually simply drops the TX
packet if we can't map it for DMA.

Signed-off-by: andrea merello <andrea.merello@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/net/wireless/rtl818x/rtl8180/dev.c b/drivers/net/wireless/rtl818x/rtl8180/dev.c
index fad616a0fa37..3867d1470b36 100644
--- a/drivers/net/wireless/rtl818x/rtl8180/dev.c
+++ b/drivers/net/wireless/rtl818x/rtl8180/dev.c
@@ -276,6 +276,13 @@ static void rtl8180_tx(struct ieee80211_hw *dev,
         mapping = pci_map_single(priv->pdev, skb->data,
                                  skb->len, PCI_DMA_TODEVICE);
 
+        if (pci_dma_mapping_error(priv->pdev, mapping)) {
+                kfree_skb(skb);
+                dev_err(&priv->pdev->dev, "TX DMA mapping error\n");
+                return;
+
+        }
+
         tx_flags = RTL818X_TX_DESC_FLAG_OWN | RTL818X_TX_DESC_FLAG_FS |
                    RTL818X_TX_DESC_FLAG_LS |
                    (ieee80211_get_tx_rate(dev, info)->hw_value << 24) |