From: andrea.merello Date: Wed, 5 Feb 2014 21:38:06 +0000 (+0100) Subject: rtl8180: Add error check for pci_map_single return value in TX path X-Git-Tag: accepted/tizen/common/20141203.182822~411^2~21^2^2~33 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=348f7d4adee97f222e3ad9ff97956ca3793d11c6;p=platform%2Fkernel%2Flinux-arm64.git 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 Signed-off-by: John W. Linville --- diff --git a/drivers/net/wireless/rtl818x/rtl8180/dev.c b/drivers/net/wireless/rtl818x/rtl8180/dev.c index fad616a..3867d14 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) |