[PATCH v2] mptlan: add checks for dma mapping errors

[Alexey Khoroshilov]

mpt_lan_sdu_send() and mpt_lan_post_receive_buckets() do not check
if mapping dma memory succeed.
The patch adds the checks and failure handling.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshi...@ispras.ru>
---
 drivers/message/fusion/mptlan.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/message/fusion/mptlan.c b/drivers/message/fusion/mptlan.c
index cbe96072a6cc..3b6c8a755713 100644
--- a/drivers/message/fusion/mptlan.c
+++ b/drivers/message/fusion/mptlan.c
@@ -734,6 +734,12 @@ mpt_lan_sdu_send (struct sk_buff *skb, struct net_device 
*dev)
 
         dma = pci_map_single(mpt_dev->pcidev, skb->data, skb->len,
                             PCI_DMA_TODEVICE);
+       if (pci_dma_mapping_error(mpt_dev->pcidev, dma)) {
+               netif_stop_queue(dev);
+
+               printk (KERN_ERR "%s: dma mapping failed\n", __func__);
+               return NETDEV_TX_BUSY;
+       }
 
        priv->SendCtl[ctx].skb = skb;
        priv->SendCtl[ctx].dma = dma;
@@ -1232,6 +1238,14 @@ mpt_lan_post_receive_buckets(struct mpt_lan_priv *priv)
 
                                dma = pci_map_single(mpt_dev->pcidev, skb->data,
                                                     len, PCI_DMA_FROMDEVICE);
+                               if (pci_dma_mapping_error(mpt_dev->pcidev, 
dma)) {
+                                       printk (KERN_WARNING
+                                               MYNAM "/%s: dma mapping 
failed\n",
+                                               __func__);
+                                       
priv->mpt_rxfidx[++priv->mpt_rxfidx_tail] = ctx;
+                                       
spin_unlock_irqrestore(&priv->rxfidx_lock, flags);
+                                       break;
+                               }
 
                                priv->RcvCtl[ctx].skb = skb;
                                priv->RcvCtl[ctx].dma = dma;
-- 
1.9.1