diff options
Diffstat (limited to 'debian/patches-rt/0168-tty-serial-8250-don-t-take-the-trylock-during-oops.patch')
| -rw-r--r-- | debian/patches-rt/0168-tty-serial-8250-don-t-take-the-trylock-during-oops.patch | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/debian/patches-rt/0168-tty-serial-8250-don-t-take-the-trylock-during-oops.patch b/debian/patches-rt/0168-tty-serial-8250-don-t-take-the-trylock-during-oops.patch new file mode 100644 index 000000000..8cb91d2aa --- /dev/null +++ b/debian/patches-rt/0168-tty-serial-8250-don-t-take-the-trylock-during-oops.patch @@ -0,0 +1,35 @@ +From bf2010a260b11e805d39d0d1a6d0302b1d3e7210 Mon Sep 17 00:00:00 2001 +From: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +Date: Mon, 11 Apr 2016 16:55:02 +0200 +Subject: [PATCH 168/347] tty: serial: 8250: don't take the trylock during oops +Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.246-rt110.tar.xz + +An oops with irqs off (panic() from irqsafe hrtimer like the watchdog +timer) will lead to a lockdep warning on each invocation and as such +never completes. +Therefore we skip the trylock in the oops case. + +Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +--- + drivers/tty/serial/8250/8250_port.c | 4 +--- + 1 file changed, 1 insertion(+), 3 deletions(-) + +diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c +index 34687c354f5e..ef8bccc0823c 100644 +--- a/drivers/tty/serial/8250/8250_port.c ++++ b/drivers/tty/serial/8250/8250_port.c +@@ -3294,10 +3294,8 @@ void serial8250_console_write(struct uart_8250_port *up, const char *s, + + serial8250_rpm_get(up); + +- if (port->sysrq) ++ if (port->sysrq || oops_in_progress) + locked = 0; +- else if (oops_in_progress) +- locked = spin_trylock_irqsave(&port->lock, flags); + else + spin_lock_irqsave(&port->lock, flags); + +-- +2.36.1 + |