Fix DAC960 driver on machines which don't support 64-bit DMA

Addresses http://bugzilla.kernel.org/show_bug.cgi?id=8942

Use PCI_DMA_* constants instead of own private definitions Fall back to
32-bit DMA mask if a 64-bit one fails

Signed-off-by: Matthew Wilcox <matthew@wil.cx>
Acked-by: Jeff Garzik <jeff@garzik.org>
Tested-by: Lars <polynomial-c@gmx.de>
Cc: Alessandro Polverini <alex@nibbles.it>
Cc: <dac@conglom-o.org>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 10 insertions, 14 deletions

diff --git a/drivers/block/DAC960.c b/drivers/block/DAC960.c
index 92bf868ca056..504a95d888b2 100644
--- a/drivers/block/DAC960.c
+++ b/drivers/block/DAC960.c
@@ -17,8 +17,8 @@
 */
 
 
-#define DAC960_DriverVersion                    "2.5.48"
-#define DAC960_DriverDate                       "14 May 2006"
+#define DAC960_DriverVersion                    "2.5.49"
+#define DAC960_DriverDate                       "21 Aug 2007"
 
 
 #include <linux/module.h>
@@ -1165,9 +1165,9 @@ static bool DAC960_V1_EnableMemoryMailboxInterface(DAC960_Controller_T
   int i;
 
   
-  if (pci_set_dma_mask(Controller->PCIDevice, DAC690_V1_PciDmaMask))
+  if (pci_set_dma_mask(Controller->PCIDevice, DMA_32BIT_MASK))
         return DAC960_Failure(Controller, "DMA mask out of range");
-  Controller->BounceBufferLimit = DAC690_V1_PciDmaMask;
+  Controller->BounceBufferLimit = DMA_32BIT_MASK;
 
   if ((hw_type == DAC960_PD_Controller) || (hw_type == DAC960_P_Controller)) {
     CommandMailboxesSize =  0;
@@ -1368,9 +1368,12 @@ static bool DAC960_V2_EnableMemoryMailboxInterface(DAC960_Controller_T
   dma_addr_t    CommandMailboxDMA;
   DAC960_V2_CommandStatus_T CommandStatus;
 
-  if (pci_set_dma_mask(Controller->PCIDevice, DAC690_V2_PciDmaMask))
-        return DAC960_Failure(Controller, "DMA mask out of range");
-  Controller->BounceBufferLimit = DAC690_V2_PciDmaMask;
+        if (!pci_set_dma_mask(Controller->PCIDevice, DMA_64BIT_MASK))
+                Controller->BounceBufferLimit = DMA_64BIT_MASK;
+        else if (!pci_set_dma_mask(Controller->PCIDevice, DMA_32BIT_MASK))
+                Controller->BounceBufferLimit = DMA_32BIT_MASK;
+        else
+                return DAC960_Failure(Controller, "DMA mask out of range");
 
   /* This is a temporary dma mapping, used only in the scope of this function */
   CommandMailbox = pci_alloc_consistent(PCI_Device,
diff --git a/drivers/block/DAC960.h b/drivers/block/DAC960.h
index f5e2436c39aa..85fa9bb63759 100644
--- a/drivers/block/DAC960.h
+++ b/drivers/block/DAC960.h
@@ -61,13 +61,6 @@
 #define DAC960_V2_MaxPhysicalDevices            272
 
 /*
-  Define the pci dma mask supported by DAC960 V1 and V2 Firmware Controlers
- */
-
-#define DAC690_V1_PciDmaMask    0xffffffff
-#define DAC690_V2_PciDmaMask    0xffffffffffffffffULL
-
-/*
   Define a 32/64 bit I/O Address data type.
 */