[PATCH 15/23] iommu/dma: Split iommu_dma_free

Christoph Hellwig
2019-05-23T07:01:25Z

From: Robin Murphy <robin.murphy@arm.com>

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>
---
drivers/iommu/dma-iommu.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index 6b8cedae7cff..33d1ce8cc640 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/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)
{
--
2.20.1