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sparc: remove not needed sbus_dma_ops methods

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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>
This commit is contained in:
Christoph Hellwig 2018-12-03 12:28:35 +01:00
parent ad78dee0b6
commit 7227b20262
1 changed files with 0 additions and 20 deletions
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20
arch/sparc/kernel/ioport.c
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@ -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)