sparc: remove not needed sbus_dma_ops methods

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@lst.de>
Acked-by: David S. Miller <davem@davemloft.net>

diff --git a/arch/sparc/kernel/ioport.c b/arch/sparc/kernel/ioport.c
index 6799c93..4b2167a 100644 (file)
--- 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)