diff options
Diffstat (limited to 'kernel/dma/dummy.c')
| -rw-r--r-- | kernel/dma/dummy.c | 26 |
1 files changed, 23 insertions, 3 deletions
diff --git a/kernel/dma/dummy.c b/kernel/dma/dummy.c index 05607642c888..92de80e5b057 100644 --- a/kernel/dma/dummy.c +++ b/kernel/dma/dummy.c @@ -2,7 +2,7 @@ /* * Dummy DMA ops that always fail. */ -#include <linux/dma-mapping.h> +#include <linux/dma-map-ops.h> static int dma_dummy_mmap(struct device *dev, struct vm_area_struct *vma, void *cpu_addr, dma_addr_t dma_addr, size_t size, @@ -17,12 +17,31 @@ static dma_addr_t dma_dummy_map_page(struct device *dev, struct page *page, { return DMA_MAPPING_ERROR; } +static void dma_dummy_unmap_page(struct device *dev, dma_addr_t dma_handle, + size_t size, enum dma_data_direction dir, unsigned long attrs) +{ + /* + * Dummy ops doesn't support map_page, so unmap_page should never be + * called. + */ + WARN_ON_ONCE(true); +} static int dma_dummy_map_sg(struct device *dev, struct scatterlist *sgl, int nelems, enum dma_data_direction dir, unsigned long attrs) { - return 0; + return -EINVAL; +} + +static void dma_dummy_unmap_sg(struct device *dev, struct scatterlist *sgl, + int nelems, enum dma_data_direction dir, + unsigned long attrs) +{ + /* + * Dummy ops doesn't support map_sg, so unmap_sg should never be called. + */ + WARN_ON_ONCE(true); } static int dma_dummy_supported(struct device *hwdev, u64 mask) @@ -33,7 +52,8 @@ static int dma_dummy_supported(struct device *hwdev, u64 mask) const struct dma_map_ops dma_dummy_ops = { .mmap = dma_dummy_mmap, .map_page = dma_dummy_map_page, + .unmap_page = dma_dummy_unmap_page, .map_sg = dma_dummy_map_sg, + .unmap_sg = dma_dummy_unmap_sg, .dma_supported = dma_dummy_supported, }; -EXPORT_SYMBOL(dma_dummy_ops); |