On 02/05/2014 03:38 PM, andrea merello wrote:
From: "andrea.merello" <andrea.merello@xxxxxxxxx>
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@xxxxxxxxx>
Signed-off-by: andrea merello <andrea.merello@xxxxxxxxx>
This code is standard for recovery from an error in pci_map_single().
Acked-by: Larry Finger <Larry.Finger@xxxxxxxxxxxx>
Larry
---
drivers/net/wireless/rtl818x/rtl8180/dev.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/net/wireless/rtl818x/rtl8180/dev.c b/drivers/net/wireless/rtl818x/rtl8180/dev.c
index 1c6ac25..9645ed2 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) |
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