--- linux/arch/ia64/hp/common/sba_iommu.c	11 Dec 2002 19:57:28 -0000	1.28
+++ linux/arch/ia64/hp/common/sba_iommu.c	31 Mar 2003 01:44:49 -0000
@@ -35,6 +35,7 @@
 #include <asm/delay.h>		/* ia64_get_itc() */
 #include <asm/io.h>
 #include <asm/page.h>		/* PAGE_OFFSET */
+#include <asm/system.h>		/* wmb() */
 
 
 #define PFX "IOC: "
@@ -816,6 +817,9 @@ sba_map_single(struct pci_dev *dev, void
 		size -= IOVP_SIZE;
 		pdir_start++;
 	}
+	/* force pdir update */
+	wmb();
+
 	/* form complete address */
 #ifdef ASSERT_PDIR_SANITY
 	sba_check_pdir(ioc,"Check after sba_map_single()");
@@ -1078,6 +1082,9 @@ sba_fill_pdir(
 		}
 		startsg++;
 	}
+	/* force pdir update */
+	wmb();
+
 #ifdef DEBUG_LARGE_SG_ENTRIES
 	dump_run_sg = 0;
 #endif