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author | Hiroshi Doyu <hdoyu@nvidia.com> | 2012-08-28 08:13:02 +0300 |
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committer | Marek Szyprowski <m.szyprowski@samsung.com> | 2012-08-28 21:01:06 +0200 |
commit | 21d0a75951ccf71f671eb24b61a8ad2b497be4b4 (patch) | |
tree | bbda40740cc2c6da52dadb3482156731a09a1a02 /arch/arm/mm/dma-mapping.c | |
parent | 6b3fe47264262fa082897ebe8ae01041eae65e14 (diff) | |
download | op-kernel-dev-21d0a75951ccf71f671eb24b61a8ad2b497be4b4.zip op-kernel-dev-21d0a75951ccf71f671eb24b61a8ad2b497be4b4.tar.gz |
ARM: dma-mapping: Refactor out to introduce __in_atomic_pool
Check the given range("start", "size") is included in "atomic_pool" or not.
Signed-off-by: Hiroshi Doyu <hdoyu@nvidia.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Diffstat (limited to 'arch/arm/mm/dma-mapping.c')
-rw-r--r-- | arch/arm/mm/dma-mapping.c | 26 |
1 files changed, 20 insertions, 6 deletions
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c index 9a21284..882eacc6 100644 --- a/arch/arm/mm/dma-mapping.c +++ b/arch/arm/mm/dma-mapping.c @@ -482,20 +482,34 @@ static void *__alloc_from_pool(size_t size, struct page **ret_page) return ptr; } +static bool __in_atomic_pool(void *start, size_t size) +{ + struct dma_pool *pool = &atomic_pool; + void *end = start + size; + void *pool_start = pool->vaddr; + void *pool_end = pool->vaddr + pool->size; + + if (start < pool_start || start > pool_end) + return false; + + if (end <= pool_end) + return true; + + WARN(1, "Wrong coherent size(%p-%p) from atomic pool(%p-%p)\n", + start, end - 1, pool_start, pool_end - 1); + + return false; +} + static int __free_from_pool(void *start, size_t size) { struct dma_pool *pool = &atomic_pool; unsigned long pageno, count; unsigned long flags; - if (start < pool->vaddr || start > pool->vaddr + pool->size) + if (!__in_atomic_pool(start, size)) return 0; - if (start + size > pool->vaddr + pool->size) { - WARN(1, "freeing wrong coherent size from pool\n"); - return 0; - } - pageno = (start - pool->vaddr) >> PAGE_SHIFT; count = size >> PAGE_SHIFT; |