sis190: handle DMA mapping errors

Signed-off-by: Denis Kirjanov <kirjanov@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 19 insertions, 8 deletions

diff --git a/drivers/net/sis190.c b/drivers/net/sis190.c
index 4487b065ef72..80af4a44580e 100644
--- a/drivers/net/sis190.c
+++ b/drivers/net/sis190.c
@@ -484,18 +484,24 @@ static struct sk_buff *sis190_alloc_rx_skb(struct sis190_private *tp,
 {
         u32 rx_buf_sz = tp->rx_buf_sz;
         struct sk_buff *skb;
+        dma_addr_t mapping;
 
         skb = netdev_alloc_skb(tp->dev, rx_buf_sz);
-        if (likely(skb)) {
-                dma_addr_t mapping;
-
-                mapping = pci_map_single(tp->pci_dev, skb->data, tp->rx_buf_sz,
-                                         PCI_DMA_FROMDEVICE);
-                sis190_map_to_asic(desc, mapping, rx_buf_sz);
-        } else
-                sis190_make_unusable_by_asic(desc);
+        if (unlikely(!skb))
+                goto skb_alloc_failed;
+        mapping = pci_map_single(tp->pci_dev, skb->data, tp->rx_buf_sz,
+                        PCI_DMA_FROMDEVICE);
+        if (pci_dma_mapping_error(tp->pci_dev, mapping))
+                goto out;
+        sis190_map_to_asic(desc, mapping, rx_buf_sz);
 
         return skb;
+
+out:
+        dev_kfree_skb_any(skb);
+skb_alloc_failed:
+        sis190_make_unusable_by_asic(desc);
+        return NULL;
 }
 
 static u32 sis190_rx_fill(struct sis190_private *tp, struct net_device *dev,
@@ -1184,6 +1190,11 @@ static netdev_tx_t sis190_start_xmit(struct sk_buff *skb,
         }
 
         mapping = pci_map_single(tp->pci_dev, skb->data, len, PCI_DMA_TODEVICE);
+        if (pci_dma_mapping_error(tp->pci_dev, mapping)) {
+                netif_err(tp, tx_err, dev,
+                                "PCI mapping failed, dropping packet");
+                return NETDEV_TX_BUSY;
+        }
 
         tp->Tx_skbuff[entry] = skb;