[Xen-ia64-devel] [PATCH] fix swiotlb_dma_supported

[Kouya Shimura <kouya@xxxxxxxxxxxxxx>]

CD/DVD-ROM on recent Dom0 is not available.
After some investigation, IDE controller is disabled
by reason that io_tlb_end is out of bounds.

Signed-off-by: Kouya Shimura <kouya@xxxxxxxxxxxxxx>

diff -r bf38300f5e63 arch/ia64/xen/swiotlb.c
--- a/arch/ia64/xen/swiotlb.c   Sun Jul 15 13:48:57 2007 -0600
+++ b/arch/ia64/xen/swiotlb.c   Tue Jul 24 15:40:05 2007 +0900
@@ -882,7 +882,11 @@ int
 int
 swiotlb_dma_supported (struct device *hwdev, u64 mask)
 {
+#ifdef CONFIG_XEN
+       return (virt_to_bus(io_tlb_end - 1)) <= mask;
+#else
        return (virt_to_bus(io_tlb_end) - 1) <= mask;
+#endif
 }
 
 EXPORT_SYMBOL(swiotlb_init);

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