p54pci: handle dma mapping errors

This patch adds error-paths to handle pci_dma_mapping errors.

Cc: <stable@kernel.org>
Signed-off-by: Christian Lamparter <chunkeey@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/p54/p54pci.c b/drivers/net/wireless/p54/p54pci.c
index a72f7c2..4bf4c21 100644 (file)
--- a/drivers/net/wireless/p54/p54pci.c
+++ b/drivers/net/wireless/p54/p54pci.c
@@ -157,6 +157,14 @@ static void p54p_refill_rx_ring(struct ieee80211_hw *dev,
                                                 skb_tail_pointer(skb),
                                                 priv->common.rx_mtu + 32,
                                                 PCI_DMA_FROMDEVICE);
+
+                       if (pci_dma_mapping_error(priv->pdev, mapping)) {
+                               dev_kfree_skb_any(skb);
+                               dev_err(&priv->pdev->dev,
+                                       "RX DMA Mapping error\n");
+                               break;
+                       }
+
                        desc->host_addr = cpu_to_le32(mapping);
                        desc->device_addr = 0;  // FIXME: necessary?
                        desc->len = cpu_to_le16(priv->common.rx_mtu + 32);
@@ -325,14 +333,20 @@ static void p54p_tx(struct ieee80211_hw *dev, struct sk_buff *skb)
        u32 device_idx, idx, i;
 
        spin_lock_irqsave(&priv->lock, flags);
-
        device_idx = le32_to_cpu(ring_control->device_idx[1]);
        idx = le32_to_cpu(ring_control->host_idx[1]);
        i = idx % ARRAY_SIZE(ring_control->tx_data);
 
-       priv->tx_buf_data[i] = skb;
        mapping = pci_map_single(priv->pdev, skb->data, skb->len,
                                 PCI_DMA_TODEVICE);
+       if (pci_dma_mapping_error(priv->pdev, mapping)) {
+               spin_unlock_irqrestore(&priv->lock, flags);
+               p54_free_skb(dev, skb);
+               dev_err(&priv->pdev->dev, "TX DMA mapping error\n");
+               return ;
+       }
+       priv->tx_buf_data[i] = skb;
+
        desc = &ring_control->tx_data[i];
        desc->host_addr = cpu_to_le32(mapping);
        desc->device_addr = ((struct p54_hdr *)skb->data)->req_id;