powerpc/iommu: don't set failed sg dma_address to DMA_MAPPING_ERROR

Setting the ->dma_address to DMA_MAPPING_ERROR is not part of
the ->map_sg calling convention, so remove it.

Link: https://lore.kernel.org/linux-mips/20210716063241.GC13345@lst.de/
Suggested-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Geoff Levand <geoff@infradead.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>

diff --git a/arch/powerpc/kernel/iommu.c b/arch/powerpc/kernel/iommu.c
index a8ec4fe..30b7736 100644 (file)
--- a/arch/powerpc/kernel/iommu.c
+++ b/arch/powerpc/kernel/iommu.c
@@ -575,7 +575,6 @@ int ppc_iommu_map_sg(struct device *dev, struct iommu_table *tbl,
         */
        if (outcount < incount) {
                outs = sg_next(outs);
-               outs->dma_address = DMA_MAPPING_ERROR;
                outs->dma_length = 0;
        }
 
@@ -593,7 +592,6 @@ int ppc_iommu_map_sg(struct device *dev, struct iommu_table *tbl,
                        npages = iommu_num_pages(s->dma_address, s->dma_length,
                                                 IOMMU_PAGE_SIZE(tbl));
                        __iommu_free(tbl, vaddr, npages);
-                       s->dma_address = DMA_MAPPING_ERROR;
                        s->dma_length = 0;
                }
                if (s == outs)