diff options
Diffstat (limited to 'arch/powerpc/lib/dma-noncoherent.c')
| -rw-r--r-- | arch/powerpc/lib/dma-noncoherent.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/arch/powerpc/lib/dma-noncoherent.c b/arch/powerpc/lib/dma-noncoherent.c index 6656d47841d..5d83907f659 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); |