DMA_ERROR_CODE is going to go away, so don't rely on it.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
drivers/xen/swiotlb-xen.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
index a0f006daab48..c3a04b2d7532 100644
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c
@@ -67,6 +67,8 @@ static unsigned long dma_alloc_coherent_mask(struct device *dev,
}
#endif
+#define XEN_SWIOTLB_ERROR_CODE (~(dma_addr_t)0x0)
+
static char *xen_io_tlb_start, *xen_io_tlb_end;
static unsigned long xen_io_tlb_nslabs;
/*
@@ -410,7 +412,7 @@ static dma_addr_t xen_swiotlb_map_page(struct device *dev, struct page *page,
map = swiotlb_tbl_map_single(dev, start_dma_addr, phys, size, dir,
attrs);
if (map == SWIOTLB_MAP_ERROR)
- return DMA_ERROR_CODE;
+ return XEN_SWIOTLB_ERROR_CODE;
dev_addr = xen_phys_to_bus(map);
xen_dma_map_page(dev, pfn_to_page(map >> PAGE_SHIFT),
@@ -425,7 +427,7 @@ static dma_addr_t xen_swiotlb_map_page(struct device *dev, struct page *page,
attrs |= DMA_ATTR_SKIP_CPU_SYNC;
swiotlb_tbl_unmap_single(dev, map, size, dir, attrs);
- return DMA_ERROR_CODE;
+ return XEN_SWIOTLB_ERROR_CODE;
}
/*
@@ -715,6 +717,11 @@ xen_swiotlb_get_sgtable(struct device *dev, struct sg_table *sgt,
return dma_common_get_sgtable(dev, sgt, cpu_addr, handle, size);
}
+static int xen_swiotlb_mapping_error(struct device *dev, dma_addr_t dma_addr)
+{
+ return dma_addr == XEN_SWIOTLB_ERROR_CODE;
+}
+
const struct dma_map_ops xen_swiotlb_dma_ops = {
.alloc = xen_swiotlb_alloc_coherent,
.free = xen_swiotlb_free_coherent,
@@ -730,4 +737,5 @@ const struct dma_map_ops xen_swiotlb_dma_ops = {
.set_dma_mask = xen_swiotlb_set_dma_mask,
.mmap = xen_swiotlb_dma_mmap,
.get_sgtable = xen_swiotlb_get_sgtable,
+ .mapping_error = xen_swiotlb_mapping_error,
};
--
2.11.0
--
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