[PATCH] sk98lin: not doing high dma properly

Sk98lin 64bit memory handling is wrong. It doesn't set the
highdma flag; i.e. the kernel always does bounce buffers.
It doesn't fallback to 32 bit mask if it can't get 64 bit mask.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

1 files changed, 24 insertions, 4 deletions

diff --git a/drivers/net/sk98lin/skge.c b/drivers/net/sk98lin/skge.c
index 3302d644011f..9a879530ef6d 100644
--- a/drivers/net/sk98lin/skge.c
+++ b/drivers/net/sk98lin/skge.c
@@ -4775,16 +4775,30 @@ static int __devinit skge_probe_one(struct pci_dev *pdev,
         struct net_device       *dev = NULL;
         static int boards_found = 0;
         int error = -ENODEV;
+        int using_dac = 0;
         char DeviceStr[80];
 
         if (pci_enable_device(pdev))
                 goto out;
  
         /* Configure DMA attributes. */
-        if (pci_set_dma_mask(pdev, DMA_64BIT_MASK) &&
-            pci_set_dma_mask(pdev, DMA_32BIT_MASK))
-                goto out_disable_device;
-
+        if (sizeof(dma_addr_t) > sizeof(u32) &&
+            !(error = pci_set_dma_mask(pdev, DMA_64BIT_MASK))) {
+                using_dac = 1;
+                error = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK);
+                if (error < 0) {
+                        printk(KERN_ERR "sk98lin %s unable to obtain 64 bit DMA "
+                               "for consistent allocations\n", pci_name(pdev));
+                        goto out_disable_device;
+                }
+        } else {
+                error = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
+                if (error) {
+                        printk(KERN_ERR "sk98lin %s no usable DMA configuration\n",
+                               pci_name(pdev));
+                        goto out_disable_device;
+                }
+        }
 
         if ((dev = alloc_etherdev(sizeof(DEV_NET))) == NULL) {
                 printk(KERN_ERR "Unable to allocate etherdev "
@@ -4843,6 +4857,9 @@ static int __devinit skge_probe_one(struct pci_dev *pdev,
 #endif
         }
 
+        if (using_dac)
+                dev->features |= NETIF_F_HIGHDMA;
+
         pAC->Index = boards_found++;
 
         if (SkGeBoardInit(dev, pAC))
@@ -4919,6 +4936,9 @@ static int __devinit skge_probe_one(struct pci_dev *pdev,
 #endif
                 }
 
+                if (using_dac)
+                        dev->features |= NETIF_F_HIGHDMA;
+
                 if (register_netdev(dev)) {
                         printk(KERN_ERR "sk98lin: Could not register device for seconf port.\n");
                         free_netdev(dev);