Merge branch 'linus' into cpus4096

Conflicts:

	drivers/acpi/processor_throttling.c

Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 9 insertions, 2 deletions

diff --git a/arch/powerpc/lib/dma-noncoherent.c b/arch/powerpc/lib/dma-noncoherent.c
index 6656d47841d0..5d83907f6591 100644
--- a/arch/powerpc/lib/dma-noncoherent.c
+++ b/arch/powerpc/lib/dma-noncoherent.c
@@ -348,8 +348,15 @@ void __dma_sync(void *vaddr, size_t size, int direction)
         switch (direction) {
         case DMA_NONE:
                 BUG();
-        case DMA_FROM_DEVICE:   /* invalidate only */
-                invalidate_dcache_range(start, end);
+        case DMA_FROM_DEVICE:
+                /*
+                 * invalidate only when cache-line aligned otherwise there is
+                 * the potential for discarding uncommitted data from the cache
+                 */
+                if ((start & (L1_CACHE_BYTES - 1)) || (size & (L1_CACHE_BYTES - 1)))
+                        flush_dcache_range(start, end);
+                else
+                        invalidate_dcache_range(start, end);
                 break;
         case DMA_TO_DEVICE:             /* writeback only */
                 clean_dcache_range(start, end);