[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>
diff --git a/drivers/net/sk98lin/skge.c b/drivers/net/sk98lin/skge.c
index 3302d64..9a87953 100644
--- a/drivers/net/sk98lin/skge.c
+++ b/drivers/net/sk98lin/skge.c
@@ -4775,16 +4775,30 @@
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 @@
#endif
}
+ if (using_dac)
+ dev->features |= NETIF_F_HIGHDMA;
+
pAC->Index = boards_found++;
if (SkGeBoardInit(dev, pAC))
@@ -4919,6 +4936,9 @@
#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);