Messages in this thread Patch in this message |  | | From | Takashi Iwai <> | Subject | [PATCH 1/2] dma-direct: Don't repeat allocation for no-op GFP_DMA | Date | Sun, 15 Apr 2018 11:08:07 +0200 |
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When an allocation with lower dma_coherent mask fails, dma_direct_alloc() retries the allocation with GFP_DMA. But, it's useless for architectures that has no ZONE_DMA, obviously.
Fix it by adding the check of CONFIG_ZONE_DMA before retrying the allocation.
Fixes: 95f183916d4b ("dma-direct: retry allocations using GFP_DMA for small masks") Signed-off-by: Takashi Iwai <tiwai@suse.de> --- lib/dma-direct.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/lib/dma-direct.c b/lib/dma-direct.c index c0bba30fef0a..bbfb229aa067 100644 --- a/lib/dma-direct.c +++ b/lib/dma-direct.c @@ -84,7 +84,8 @@ void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle, __free_pages(page, page_order); page = NULL; - if (dev->coherent_dma_mask < DMA_BIT_MASK(32) && + if (IS_ENABLED(CONFIG_ZONE_DMA) && + dev->coherent_dma_mask < DMA_BIT_MASK(32) && !(gfp & GFP_DMA)) { gfp = (gfp & ~GFP_DMA32) | GFP_DMA; goto again; -- 2.16.3
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