dma-pool: get rid of dma_in_atomic_pool()

The function is only used once and can be simplified to a one-liner.
Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>

kernel/dma/pool.c

@@ -217,15 +217,6 @@ static inline struct gen_pool *dev_to_pool(struct device *dev)
 	return atomic_pool_kernel;
 }
 
-static bool dma_in_atomic_pool(struct device *dev, void *start, size_t size)
-{
-	struct gen_pool *pool = dev_to_pool(dev);
-
-	if (unlikely(!pool))
-		return false;
-	return gen_pool_has_addr(pool, (unsigned long)start, size);
-}
-
 void *dma_alloc_from_pool(struct device *dev, size_t size,
 			  struct page **ret_page, gfp_t flags)
 {
@@ -260,7 +251,7 @@ bool dma_free_from_pool(struct device *dev, void *start, size_t size)
 {
 	struct gen_pool *pool = dev_to_pool(dev);
 
-	if (!dma_in_atomic_pool(dev, start, size))
+	if (!pool || !gen_pool_has_addr(pool, (unsigned long)start, size))
 		return false;
 	gen_pool_free(pool, (unsigned long)start, size);
 	return true;