ieee1394: sbp2: enforce 32bit DMA mapping

In order to use OHCI-1394 physical DMA, all s/g elements, s/g tables,
ORBs, and response buffers have to reside within the first 4 GB of the
FireWire controller's physical address space.  Set the correct mask for
DMA mappings.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/ieee1394/sbp2.c b/drivers/ieee1394/sbp2.c
index 4edfff46b1e6..e15b5d7b9a02 100644
--- a/drivers/ieee1394/sbp2.c
+++ b/drivers/ieee1394/sbp2.c
@@ -757,6 +757,11 @@ static struct sbp2_lu *sbp2_alloc_device(struct unit_directory *ud)
                         SBP2_ERR("failed to register lower 4GB address range");
                         goto failed_alloc;
                 }
+#else
+                if (dma_set_mask(hi->host->device.parent, DMA_32BIT_MASK)) {
+                        SBP2_ERR("failed to set 4GB DMA mask");
+                        goto failed_alloc;
+                }
 #endif
         }