On an iMac G5, the b43 driver is failing to initialise because trying to
set the dma mask to 30-bit fails. Even though there's only 512MiB of RAM
in the machine anyway:
https://bugzilla.redhat.com/show_bug.cgi?id=514787
We should probably let it succeed if the available RAM in the system
doesn't exceed the requested limit.
Signed-off-by: David Woodhouse <david.woodho...@intel.com>
diff --git a/arch/powerpc/kernel/dma.c b/arch/powerpc/kernel/dma.c
index 20a60d6..1769a8e 100644
--- a/arch/powerpc/kernel/dma.c
+++ b/arch/powerpc/kernel/dma.c
@@ -90,11 +90,11 @@ static void dma_direct_unmap_sg(struct device *dev,
struct scatterlist *sg,
static int dma_direct_dma_supported(struct device *dev, u64 mask)
{
#ifdef CONFIG_PPC64
- /* Could be improved to check for memory though it better be
- * done via some global so platforms can set the limit in case
+ extern unsigned long highest_memmap_pfn;
+ /* Could be improved so platforms can set the limit in case
* they have limited DMA windows
*/
- return mask >= DMA_BIT_MASK(32);
+ return (mask >> PAGE_SHIFT) >= highest_memmap_pfn;
#else
return 1;
#endif
--
David Woodhouse Open Source Technology Centre
david.woodho...@intel.com Intel Corporation
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