diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index 55b2f3dc6bb3f67bae87a09c173ff2fb5613844e..63d402f75e25c5d2de8a39cabac8b6d76cba1d05 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -496,7 +496,9 @@ do_cache_op(unsigned long start, unsigned long end, int flags)
 		if (end > vma->vm_end)
 			end = vma->vm_end;
 
+		up_read(&mm->mmap_sem);
 		flush_cache_user_range(start, end);
+		return;
 	}
 	up_read(&mm->mmap_sem);
 }