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ARM: dma-mapping: Refactor out to introduce __in_atomic_pool

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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>
This commit is contained in:
Hiroshi Doyu 2012-08-28 08:13:02 +03:00 committed by Marek Szyprowski
parent 6b3fe47264
commit 21d0a75951
1 changed files with 20 additions and 6 deletions
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26
arch/arm/mm/dma-mapping.c
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@ -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;