[PATCH 2/8] xen-swiotlb: use is_swiotlb_buffer in is_xen_swiotlb_buffer

[Christoph Hellwig <hch@xxxxxx>]

Use the is_swiotlb_buffer to check if a physical address is
a swiotlb buffer.  This works because xen-swiotlb does use the
same buffer as the main swiotlb code, and xen_io_tlb_{start,end}
are just the addresses for it that went through phys_to_virt.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
 drivers/xen/swiotlb-xen.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
index 2b385c1b4a99cb..a4026822a889f7 100644
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c
@@ -111,10 +111,8 @@ static int is_xen_swiotlb_buffer(struct device *dev, 
dma_addr_t dma_addr)
         * have the same virtual address as another address
         * in our domain. Therefore _only_ check address within our domain.
         */
-       if (pfn_valid(PFN_DOWN(paddr))) {
-               return paddr >= virt_to_phys(xen_io_tlb_start) &&
-                      paddr < virt_to_phys(xen_io_tlb_end);
-       }
+       if (pfn_valid(PFN_DOWN(paddr)))
+               return is_swiotlb_buffer(paddr);
        return 0;
 }
 
-- 
2.29.2