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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>
This commit is contained in:
andrea.merello 2014-02-05 22:38:06 +01:00 committed by John W. Linville
parent 2b4db05e7e
commit 348f7d4ade
1 changed files with 7 additions and 0 deletions
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7
drivers/net/wireless/rtl818x/rtl8180/dev.c
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@ -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) |