36 lines
1.2 KiB
Diff
36 lines
1.2 KiB
Diff
From cfdff0a4d70b2b13d7088037e29e4795d031a127 Mon Sep 17 00:00:00 2001
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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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Date: Mon, 11 Apr 2016 16:55:02 +0200
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Subject: [PATCH 169/290] tty: serial: 8250: don't take the trylock during oops
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Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.94-rt38.tar.xz
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An oops with irqs off (panic() from irqsafe hrtimer like the watchdog
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timer) will lead to a lockdep warning on each invocation and as such
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never completes.
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Therefore we skip the trylock in the oops case.
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Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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---
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drivers/tty/serial/8250/8250_port.c | 4 +---
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1 file changed, 1 insertion(+), 3 deletions(-)
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diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
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index aa4de6907f77..6b1d46c1df3b 100644
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--- a/drivers/tty/serial/8250/8250_port.c
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+++ b/drivers/tty/serial/8250/8250_port.c
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@@ -3239,10 +3239,8 @@ void serial8250_console_write(struct uart_8250_port *up, const char *s,
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serial8250_rpm_get(up);
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- if (port->sysrq)
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+ if (port->sysrq || oops_in_progress)
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locked = 0;
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- else if (oops_in_progress)
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- locked = spin_trylock_irqsave(&port->lock, flags);
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else
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spin_lock_irqsave(&port->lock, flags);
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--
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2.24.1
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