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From: John Ogness <john.ogness@linutronix.de>
Date: Mon, 2 Oct 2023 15:30:43 +0000
Subject: [PATCH 43/46] serial: 8250: Revert "drop lockdep annotation from
serial8250_clear_IER()"
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/6.9/older/patches-6.9-rt5.tar.xz
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(+)
--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -719,6 +719,9 @@ 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);
}
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