From: John Ogness <john.ogness@linutronix.de>
Date: Mon, 2 Oct 2023 15:30:43 +0000
Subject: [PATCH 45/48] serial: 8250: Revert "drop lockdep annotation from
 serial8250_clear_IER()"

The 8250 driver no longer depends on @oops_in_progress and
will no longer violate the port->lock locking constraints.

This reverts commit 3d9e6f556e235ddcdc9f73600fdd46fe1736b090.

Signed-off-by: John Ogness <john.ogness@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 drivers/tty/serial/8250/8250_port.c |    3 +++
 1 file changed, 3 insertions(+)

Index: linux-6.8.2-rt10/drivers/tty/serial/8250/8250_port.c
===================================================================
@ linux-6.8.2-rt10/drivers/tty/serial/8250/8250_port.c:726 @ static void __serial8250_clear_IER(struc
 
 static inline void serial8250_clear_IER(struct uart_8250_port *up)
 {
+	/* Port locked to synchronize UART_IER access against the console. */
+	lockdep_assert_held_once(&up->port.lock);
+
 	__serial8250_clear_IER(up);
 }