No need to BUG_ON() on the cache maintainance ops - they are no-ops
by default, and there is nothing in the DMA API contract that prohibits
calling them on sbus devices (even if such drivers are unlikely to
ever appear).
Similarly a dma_supported method that always returns 0 is rather
pointless. The only thing that indicates is that no one ever calls
the method on sbus devices.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
arch/sparc/kernel/ioport.c | 20 --------------------
1 file changed, 20 deletions(-)
diff --git a/arch/sparc/kernel/ioport.c b/arch/sparc/kernel/ioport.c
index 6799c93c9f27..4b2167a0ec0b 100644
--- a/arch/sparc/kernel/ioport.c
+++ b/arch/sparc/kernel/ioport.c
@@ -391,23 +391,6 @@ static void sbus_unmap_sg(struct device *dev, struct scatterlist *sg, int n,
mmu_release_scsi_sgl(dev, sg, n);
}
-static void sbus_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
- int n, enum dma_data_direction dir)
-{
- BUG();
-}
-
-static void sbus_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
- int n, enum dma_data_direction dir)
-{
- BUG();
-}
-
-static int sbus_dma_supported(struct device *dev, u64 mask)
-{
- return 0;
-}
-
static const struct dma_map_ops sbus_dma_ops = {
.alloc = sbus_alloc_coherent,
.free = sbus_free_coherent,
@@ -415,9 +398,6 @@ static const struct dma_map_ops sbus_dma_ops = {
.unmap_page = sbus_unmap_page,
.map_sg = sbus_map_sg,
.unmap_sg = sbus_unmap_sg,
- .sync_sg_for_cpu = sbus_sync_sg_for_cpu,
- .sync_sg_for_device = sbus_sync_sg_for_device,
- .dma_supported = sbus_dma_supported,
};
static int __init sparc_register_ioport(void)
--
2.19.2
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