swiotlb: use iommu_is_span_boundary helper function

[linux-2.6.git] / lib / swiotlb.c

diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index 256c844..3c95922 100644 (file)
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -31,6 +31,7 @@
 
 #include <linux/init.h>
 #include <linux/bootmem.h>
+#include <linux/iommu-helper.h>
 
 #define OFFSET(val,align) ((unsigned long)     \
                           ( (val) & ( (align) - 1)))
@@ -282,15 +283,6 @@ address_needs_mapping(struct device *hwdev, dma_addr_t addr)
        return (addr & ~mask) != 0;
 }
 
-static inline unsigned int is_span_boundary(unsigned int index,
-                                           unsigned int nslots,
-                                           unsigned long offset_slots,
-                                           unsigned long max_slots)
-{
-       unsigned long offset = (offset_slots + index) & (max_slots - 1);
-       return offset + nslots > max_slots;
-}
-
 /*
  * Allocates bounce buffer and returns its kernel virtual address.
  */
@@ -337,8 +329,8 @@ map_single(struct device *hwdev, char *buffer, size_t size, int dir)
        wrap = index;
 
        do {
-               while (is_span_boundary(index, nslots, offset_slots,
-                               max_slots)) {
+               while (iommu_is_span_boundary(index, nslots, offset_slots,
+                                             max_slots)) {
                        index += stride;
                        if (index >= io_tlb_nslabs)
                                index = 0;