[PATCH] x86_64: Check for bad dma address in b44 1GB DMA workaround

Needed for interaction with the nommu code in x86-64 which
will return bad_dma_address if the address exceeds dma_mask.

Cc: netdev@vger.kernel.org
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 18 insertions, 10 deletions

diff --git a/drivers/net/b44.c b/drivers/net/b44.c
index 3d306681919e..d8233e0b7899 100644
--- a/drivers/net/b44.c
+++ b/drivers/net/b44.c
@@ -650,9 +650,11 @@ static int b44_alloc_rx_skb(struct b44 *bp, int src_idx, u32 dest_idx_unmasked)
 
         /* Hardware bug work-around, the chip is unable to do PCI DMA
            to/from anything above 1GB :-( */
-        if (mapping + RX_PKT_BUF_SZ > B44_DMA_MASK) {
+        if (dma_mapping_error(mapping) ||
+                mapping + RX_PKT_BUF_SZ > B44_DMA_MASK) {
                 /* Sigh... */
-                pci_unmap_single(bp->pdev, mapping, RX_PKT_BUF_SZ,PCI_DMA_FROMDEVICE);
+                if (!dma_mapping_error(mapping))
+                        pci_unmap_single(bp->pdev, mapping, RX_PKT_BUF_SZ,PCI_DMA_FROMDEVICE);
                 dev_kfree_skb_any(skb);
                 skb = __dev_alloc_skb(RX_PKT_BUF_SZ,GFP_DMA);
                 if (skb == NULL)
@@ -660,8 +662,10 @@ static int b44_alloc_rx_skb(struct b44 *bp, int src_idx, u32 dest_idx_unmasked)
                 mapping = pci_map_single(bp->pdev, skb->data,
                                          RX_PKT_BUF_SZ,
                                          PCI_DMA_FROMDEVICE);
-                if (mapping + RX_PKT_BUF_SZ > B44_DMA_MASK) {
-                        pci_unmap_single(bp->pdev, mapping, RX_PKT_BUF_SZ,PCI_DMA_FROMDEVICE);
+                if (dma_mapping_error(mapping) ||
+                        mapping + RX_PKT_BUF_SZ > B44_DMA_MASK) {
+                        if (!dma_mapping_error(mapping))
+                                pci_unmap_single(bp->pdev, mapping, RX_PKT_BUF_SZ,PCI_DMA_FROMDEVICE);
                         dev_kfree_skb_any(skb);
                         return -ENOMEM;
                 }
@@ -967,9 +971,10 @@ static int b44_start_xmit(struct sk_buff *skb, struct net_device *dev)
         }
 
         mapping = pci_map_single(bp->pdev, skb->data, len, PCI_DMA_TODEVICE);
-        if (mapping + len > B44_DMA_MASK) {
+        if (dma_mapping_error(mapping) || mapping + len > B44_DMA_MASK) {
                 /* Chip can't handle DMA to/from >1GB, use bounce buffer */
-                pci_unmap_single(bp->pdev, mapping, len, PCI_DMA_TODEVICE);
+                if (!dma_mapping_error(mapping))
+                        pci_unmap_single(bp->pdev, mapping, len, PCI_DMA_TODEVICE);
 
                 bounce_skb = __dev_alloc_skb(TX_PKT_BUF_SZ,
                                              GFP_ATOMIC|GFP_DMA);
@@ -978,8 +983,9 @@ static int b44_start_xmit(struct sk_buff *skb, struct net_device *dev)
 
                 mapping = pci_map_single(bp->pdev, bounce_skb->data,
                                          len, PCI_DMA_TODEVICE);
-                if (mapping + len > B44_DMA_MASK) {
-                        pci_unmap_single(bp->pdev, mapping,
+                if (dma_mapping_error(mapping) || mapping + len > B44_DMA_MASK) {
+                        if (!dma_mapping_error(mapping))
+                                pci_unmap_single(bp->pdev, mapping,
                                          len, PCI_DMA_TODEVICE);
                         dev_kfree_skb_any(bounce_skb);
                         goto err_out;
@@ -1203,7 +1209,8 @@ static int b44_alloc_consistent(struct b44 *bp)
                                              DMA_TABLE_BYTES,
                                              DMA_BIDIRECTIONAL);
 
-                if (rx_ring_dma + size > B44_DMA_MASK) {
+                if (dma_mapping_error(rx_ring_dma) ||
+                        rx_ring_dma + size > B44_DMA_MASK) {
                         kfree(rx_ring);
                         goto out_err;
                 }
@@ -1229,7 +1236,8 @@ static int b44_alloc_consistent(struct b44 *bp)
                                              DMA_TABLE_BYTES,
                                              DMA_TO_DEVICE);
 
-                if (tx_ring_dma + size > B44_DMA_MASK) {
+                if (dma_mapping_error(tx_ring_dma) ||
+                        tx_ring_dma + size > B44_DMA_MASK) {
                         kfree(tx_ring);
                         goto out_err;
                 }