xen: make xen_create_contiguous_region return the dma address

Modify xen_create_contiguous_region to return the dma address of the
newly contiguous buffer.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: David Vrabel <david.vrabel@citrix.com>


Changes in v4:
- use virt_to_machine instead of virt_to_bus.

1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
index 1b2277c311d2..b72f31c1e018 100644
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c
@@ -126,6 +126,7 @@ xen_swiotlb_fixup(void *buf, size_t size, unsigned long nslabs)
 {
         int i, rc;
         int dma_bits;
+        dma_addr_t dma_handle;
 
         dma_bits = get_order(IO_TLB_SEGSIZE << IO_TLB_SHIFT) + PAGE_SHIFT;
 
@@ -137,7 +138,7 @@ xen_swiotlb_fixup(void *buf, size_t size, unsigned long nslabs)
                         rc = xen_create_contiguous_region(
                                 (unsigned long)buf + (i << IO_TLB_SHIFT),
                                 get_order(slabs << IO_TLB_SHIFT),
-                                dma_bits);
+                                dma_bits, &dma_handle);
                 } while (rc && dma_bits++ < max_dma_bits);
                 if (rc)
                         return rc;
@@ -294,11 +295,10 @@ xen_swiotlb_alloc_coherent(struct device *hwdev, size_t size,
                 *dma_handle = dev_addr;
         else {
                 if (xen_create_contiguous_region(vstart, order,
-                                                 fls64(dma_mask)) != 0) {
+                                                 fls64(dma_mask), dma_handle) != 0) {
                         free_pages(vstart, order);
                         return NULL;
                 }
-                *dma_handle = virt_to_machine(ret).maddr;
         }
         memset(ret, 0, size);
         return ret;