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Message-Id: <1432495857-10630-1-git-send-email-lorenx4@gmail.com>
Date: Sun, 24 May 2015 21:30:57 +0200
From: Lorenzo Nava <lorenx4@...il.com>
To: linux@....linux.org.uk
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
catalin.marinas@....com, Lorenzo Nava <lorenx4@...il.com>
Subject: [PATCH] arm DMA: Fix allocation from CMA for coherent DMA
This patch is to allow the use of CMA for DMA coherent memory allocation.
At the moment if "is_coherent" is set to true the allocation can't use the CMA, which I think is not the desired behaviour.
---
arch/arm/mm/dma-mapping.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index 7e7583d..cc9382a 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -645,9 +645,9 @@ static void *__dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
size = PAGE_ALIGN(size);
want_vaddr = !dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING, attrs);
- if (is_coherent || nommu())
+ if (nommu())
addr = __alloc_simple_buffer(dev, size, gfp, &page);
- else if (!(gfp & __GFP_WAIT))
+ else if (!is_coherent && !(gfp & __GFP_WAIT))
addr = __alloc_from_pool(size, &page);
else if (!dev_get_cma_area(dev))
addr = __alloc_remap_buffer(dev, size, gfp, prot, &page, caller, want_vaddr);
--
1.7.10.4
--
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