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dma-direct: don't retry allocation for no-op GFP_DMA 

When an allocation with lower dma_coherent mask fails, dma_direct_alloc()
retries the allocation with GFP_DMA.  But, this is useless for
architectures that hav no ZONE_DMA.

Fix it by adding the check of CONFIG_ZONE_DMA before retrying the
allocation.

Fixes: 95f183916d ("dma-direct: retry allocations using GFP_DMA for small masks")
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Takashi Iwai 2018-04-15 11:08:07 +02:00 committed by Christoph Hellwig
parent 6d08b06e67
commit 504a918e67
1 changed files with 2 additions and 1 deletions
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3
lib/dma-direct.c
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@ -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;