diff --git a/[refs] b/[refs]
index fdaaa74d34ea..b6745a869f52 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 5e0b537c7d94efe3fea0fee8e2533c3231a8af75
+refs/heads/master: 53b8b3ffd5e0b10f3c683096a663d0cc22179c43
diff --git a/trunk/drivers/infiniband/hw/mthca/mthca_provider.c b/trunk/drivers/infiniband/hw/mthca/mthca_provider.c
index bfd33a470020..9acb8c54ce4f 100644
--- a/trunk/drivers/infiniband/hw/mthca/mthca_provider.c
+++ b/trunk/drivers/infiniband/hw/mthca/mthca_provider.c
@@ -35,6 +35,7 @@
  */
 
 #include <ib_smi.h>
+#include <linux/mm.h>
 
 #include "mthca_dev.h"
 #include "mthca_cmd.h"
@@ -340,6 +341,22 @@ static int mthca_dealloc_ucontext(struct ib_ucontext *context)
 	return 0;
 }
 
+static int mthca_mmap_uar(struct ib_ucontext *context,
+			  struct vm_area_struct *vma)
+{
+	if (vma->vm_end - vma->vm_start != PAGE_SIZE)
+		return -EINVAL;
+
+	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+
+	if (remap_pfn_range(vma, vma->vm_start,
+			    to_mucontext(context)->uar.pfn,
+			    PAGE_SIZE, vma->vm_page_prot))
+		return -EAGAIN;
+
+	return 0;
+}
+
 static struct ib_pd *mthca_alloc_pd(struct ib_device *ibdev,
 				    struct ib_ucontext *context,
 				    struct ib_udata *udata)
@@ -766,6 +783,7 @@ int mthca_register_device(struct mthca_dev *dev)
 	dev->ib_dev.query_gid            = mthca_query_gid;
 	dev->ib_dev.alloc_ucontext       = mthca_alloc_ucontext;
 	dev->ib_dev.dealloc_ucontext     = mthca_dealloc_ucontext;
+	dev->ib_dev.mmap                 = mthca_mmap_uar;
 	dev->ib_dev.alloc_pd             = mthca_alloc_pd;
 	dev->ib_dev.dealloc_pd           = mthca_dealloc_pd;
 	dev->ib_dev.create_ah            = mthca_ah_create;