diff --git a/[refs] b/[refs]
index f31db010a480..023ab48f7467 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 9d7ab1f4d56dffcddc1177b3cd55b6da6620e1e1
+refs/heads/master: 2f72ba43581890d003427053ebe4dfaa14e5f4b0
diff --git a/trunk/arch/sparc/mm/io-unit.c b/trunk/arch/sparc/mm/io-unit.c
index 42c1c700c0a7..2bb1309003dd 100644
--- a/trunk/arch/sparc/mm/io-unit.c
+++ b/trunk/arch/sparc/mm/io-unit.c
@@ -64,6 +64,7 @@ iounit_init(int sbi_node, int io_node, struct sbus_bus *sbus)
 	
 	sbus->iommu = (struct iommu_struct *)iounit;
 	iounit->page_table = xpt;
+	spin_lock_init(&iounit->lock);
 	
 	for (xptend = iounit->page_table + (16 * PAGE_SIZE) / sizeof(iopte_t);
 	     xpt < xptend;)