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arm: dma-mapping: add checking cma area initialized

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If CMA is turned on and CMA size is set to zero, kernel should
behave as if CMA was not enabled at compile time.
Every dma allocation should check existence of cma area
before requesting memory.

Signed-off-by: Gioh Kim <gioh.kim@lge.com>
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Acked-by: Michal Nazarewicz <mina86@mina86.com>
[mszyprow: removed redundant empty line from the patch]
Signed-off-by: <m.szyprowski@samsung.com>
This commit is contained in:
Gioh Kim 2014-05-22 13:38:23 +09:00 committed by Marek Szyprowski
parent 006f841db1
commit e464ef16c4
1 changed files with 3 additions and 3 deletions
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6
arch/arm/mm/dma-mapping.c
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@ -390,7 +390,7 @@ static int __init atomic_pool_init(void)
if (!pages)
goto no_pages;
if (IS_ENABLED(CONFIG_DMA_CMA))
if (dev_get_cma_area(NULL))
ptr = __alloc_from_contiguous(NULL, pool->size, prot, &page,
atomic_pool_init);
else
@ -701,7 +701,7 @@ static void *__dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
addr = __alloc_simple_buffer(dev, size, gfp, &page);
else if (!(gfp & __GFP_WAIT))
addr = __alloc_from_pool(size, &page);
else if (!IS_ENABLED(CONFIG_DMA_CMA))
else if (!dev_get_cma_area(dev))
addr = __alloc_remap_buffer(dev, size, gfp, prot, &page, caller);
else
addr = __alloc_from_contiguous(dev, size, prot, &page, caller);
@ -790,7 +790,7 @@ static void __arm_dma_free(struct device *dev, size_t size, void *cpu_addr,
__dma_free_buffer(page, size);
} else if (__free_from_pool(cpu_addr, size)) {
return;
} else if (!IS_ENABLED(CONFIG_DMA_CMA)) {
} else if (!dev_get_cma_area(dev)) {
__dma_free_remap(cpu_addr, size);
__dma_free_buffer(page, size);
} else {