[PATCH 1/2] dma-direct: Don't repeat allocation for no-op GFP_DMA
From: Takashi Iwai
Date: Thu Apr 12 2018 - 03:46:12 EST
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 GFP_DMA, obviously.
This patch fixes it by adding the check of GFP_DMA before retrying the
allocation.
Fixes: 95f183916d4b ("dma-direct: retry allocations using GFP_DMA for small masks")
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
---
lib/dma-direct.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/lib/dma-direct.c b/lib/dma-direct.c
index c0bba30fef0a..191f96453419 100644
--- a/lib/dma-direct.c
+++ b/lib/dma-direct.c
@@ -84,7 +84,7 @@ 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 (GFP_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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