diff --git a/fs/locks.c b/fs/locks.c
index b49e853a9c7b..4cd25781b0a4 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -388,6 +388,18 @@ static int flock64_to_posix_lock(struct file *filp, struct file_lock *fl,
 	fl->fl_ops = NULL;
 	fl->fl_lmops = NULL;
 
+	/* Ensure that fl->fl_filp has compatible f_mode */
+	switch (l->l_type) {
+	case F_RDLCK:
+		if (!(filp->f_mode & FMODE_READ))
+			return -EBADF;
+		break;
+	case F_WRLCK:
+		if (!(filp->f_mode & FMODE_WRITE))
+			return -EBADF;
+		break;
+	}
+
 	return assign_type(fl, l->l_type);
 }
 
@@ -2025,23 +2037,6 @@ again:
 		file_lock->fl_flags |= FL_SLEEP;
 	}
 	
-	error = -EBADF;
-	switch (flock.l_type) {
-	case F_RDLCK:
-		if (!(filp->f_mode & FMODE_READ))
-			goto out;
-		break;
-	case F_WRLCK:
-		if (!(filp->f_mode & FMODE_WRITE))
-			goto out;
-		break;
-	case F_UNLCK:
-		break;
-	default:
-		error = -EINVAL;
-		goto out;
-	}
-
 	error = do_lock_file_wait(filp, cmd, file_lock);
 
 	/*
@@ -2143,23 +2138,6 @@ again:
 		file_lock->fl_flags |= FL_SLEEP;
 	}
 	
-	error = -EBADF;
-	switch (flock.l_type) {
-	case F_RDLCK:
-		if (!(filp->f_mode & FMODE_READ))
-			goto out;
-		break;
-	case F_WRLCK:
-		if (!(filp->f_mode & FMODE_WRITE))
-			goto out;
-		break;
-	case F_UNLCK:
-		break;
-	default:
-		error = -EINVAL;
-		goto out;
-	}
-
 	error = do_lock_file_wait(filp, cmd, file_lock);
 
 	/*