1 files changed, 14 insertions, 0 deletions
diff --git a/mm/mprotect.c b/mm/mprotect.c
index a1bfe9545770..6d3e2f082290 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -125,6 +125,20 @@ static unsigned long change_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
 
 				pages++;
 			}
+
+			if (is_write_device_private_entry(entry)) {
+				pte_t newpte;
+
+				/*
+				 * We do not preserve soft-dirtiness. See
+				 * copy_one_pte() for explanation.
+				 */
+				make_device_private_entry_read(&entry);
+				newpte = swp_entry_to_pte(entry);
+				set_pte_at(mm, addr, pte, newpte);
+
+				pages++;
+			}
 		}
 	} while (pte++, addr += PAGE_SIZE, addr != end);
 	arch_leave_lazy_mmu_mode();