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Subject[PATCH v6 15/19] swiotlb-xen: call dma_capable only if dev->dma_mask is allocated
Date
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
---
drivers/xen/swiotlb-xen.c | 6 +++---
1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
index 790c2eb..3011736 100644
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c
@@ -512,7 +512,7 @@ dma_addr_t xen_swiotlb_map_page(struct device *dev, struct page *page,
* buffering it.
*/
if (!xen_feature(XENFEAT_auto_translated_physmap) &&
- dma_capable(dev, dev_addr, size) &&
+ dev->dma_mask && dma_capable(dev, dev_addr, size) &&
!range_straddles_page_boundary(phys, size) && !swiotlb_force)
return dev_addr;

@@ -532,7 +532,7 @@ dma_addr_t xen_swiotlb_map_page(struct device *dev, struct page *page,
/*
* Ensure that the address returned is DMA'ble
*/
- if (!dma_capable(dev, dev_addr, size)) {
+ if (dev->dma_mask && !dma_capable(dev, dev_addr, size)) {
swiotlb_tbl_unmap_single(dev, map, size, dir);
dev_addr = 0;
}
@@ -660,7 +660,7 @@ xen_swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl,

if (swiotlb_force ||
xen_feature(XENFEAT_auto_translated_physmap) ||
- !dma_capable(hwdev, dev_addr, sg->length) ||
+ (hwdev->dma_mask && !dma_capable(hwdev, dev_addr, sg->length)) ||
range_straddles_page_boundary(paddr, sg->length)) {
/*
* Pass the dma_addr of the first slab in the iotlb buffer as
--
1.7.2.5


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