diff --git a/mm/gup.c b/mm/gup.c
index c057784..dee142e 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -279,6 +279,8 @@
 			spin_unlock(ptl);
 			ret = 0;
 			split_huge_pmd(vma, pmd, address);
+			if (pmd_trans_unstable(pmd))
+				ret = -EBUSY;
 		} else {
 			get_page(page);
 			spin_unlock(ptl);