iommu/dma: Split iommu_dma_free

Most of it can double up to serve the failure cleanup path for
iommu_dma_alloc().
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/dma-iommu.c

@@ -935,15 +935,12 @@ static void iommu_dma_unmap_resource(struct device *dev, dma_addr_t handle,
 	__iommu_dma_unmap(dev, handle, size);
 }
 
-static void iommu_dma_free(struct device *dev, size_t size, void *cpu_addr,
-		dma_addr_t handle, unsigned long attrs)
+static void __iommu_dma_free(struct device *dev, size_t size, void *cpu_addr)
 {
 	size_t alloc_size = PAGE_ALIGN(size);
 	int count = alloc_size >> PAGE_SHIFT;
 	struct page *page = NULL, **pages = NULL;
 
-	__iommu_dma_unmap(dev, handle, size);
-
 	/* Non-coherent atomic allocation? Easy */
 	if (dma_free_from_pool(cpu_addr, alloc_size))
 		return;
@@ -968,6 +965,13 @@ static void iommu_dma_free(struct device *dev, size_t size, void *cpu_addr,
 		__free_pages(page, get_order(alloc_size));
 }
 
+static void iommu_dma_free(struct device *dev, size_t size, void *cpu_addr,
+		dma_addr_t handle, unsigned long attrs)
+{
+	__iommu_dma_unmap(dev, handle, size);
+	__iommu_dma_free(dev, size, cpu_addr);
+}
+
 static void *iommu_dma_alloc(struct device *dev, size_t size,
 		dma_addr_t *handle, gfp_t gfp, unsigned long attrs)
 {