1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/android/binder_alloc.c b/drivers/android/binder_alloc.c
index 5a426c877dfb..4f382d51def1 100644
--- a/drivers/android/binder_alloc.c
+++ b/drivers/android/binder_alloc.c
@@ -219,7 +219,7 @@ static int binder_update_page_range(struct binder_alloc *alloc, int allocate,
                 mm = alloc->vma_vm_mm;
 
         if (mm) {
-                down_write(&mm->mmap_sem);
+                down_read(&mm->mmap_sem);
                 vma = alloc->vma;
         }
 
@@ -288,7 +288,7 @@ static int binder_update_page_range(struct binder_alloc *alloc, int allocate,
                 /* vm_insert_page does not seem to increment the refcount */
         }
         if (mm) {
-                up_write(&mm->mmap_sem);
+                up_read(&mm->mmap_sem);
                 mmput(mm);
         }
         return 0;
@@ -321,7 +321,7 @@ err_page_ptr_cleared:
         }
 err_no_vma:
         if (mm) {
-                up_write(&mm->mmap_sem);
+                up_read(&mm->mmap_sem);
                 mmput(mm);
         }
         return vma ? -ENOMEM : -ESRCH;