2 files changed, 11 insertions, 1 deletions

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index c567f219191d..1faa5087dc86 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -389,6 +389,16 @@ config DEBUG_LIST
 
           If unsure, say N.
 
+config DEBUG_SG
+        bool "Debug SG table operations"
+        depends on DEBUG_KERNEL
+        help
+          Enable this to turn on checks on scatter-gather tables. This can
+          help find problems with drivers that do not properly initialize
+          their sg tables.
+
+          If unsure, say N.
+
 config FRAME_POINTER
         bool "Compile the kernel with frame pointers"
         depends on DEBUG_KERNEL && (X86 || CRIS || M68K || M68KNOMMU || FRV || UML || S390 || AVR32 || SUPERH || BFIN)
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index 752fd95323f3..1a8050ade861 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -35,7 +35,7 @@
 #define OFFSET(val,align) ((unsigned long)      \
                            ( (val) & ( (align) - 1)))
 
-#define SG_ENT_VIRT_ADDRESS(sg) (page_address((sg)->page) + (sg)->offset)
+#define SG_ENT_VIRT_ADDRESS(sg) (sg_virt((sg)))
 #define SG_ENT_PHYS_ADDRESS(sg) virt_to_bus(SG_ENT_VIRT_ADDRESS(sg))
 
 /*