blob: d9ff20d04247541e4769c2c74a9c3875764f9fc4 [file] [log] [blame]
From ad6950253380e46355c219057ede58162280a723 Mon Sep 17 00:00:00 2001
From: Leo Yan <>
Date: Wed, 27 Nov 2019 22:15:43 +0800
Subject: [PATCH] tty: serial: msm_serial: Fix lockup for sysrq and oops
commit 0e4f7f920a5c6bfe5e851e989f27b35a0cc7fb7e upstream.
As the commit 677fe555cbfb ("serial: imx: Fix recursive locking bug")
has mentioned the uart driver might cause recursive locking between
normal printing and the kernel debugging facilities (e.g. sysrq and
oops). In the commit it gave out suggestion for fixing recursive
locking issue: "The solution is to avoid locking in the sysrq case
and trylock in the oops_in_progress case."
This patch follows the suggestion (also used the exactly same code with
other serial drivers, e.g. amba-pl011.c) to fix the recursive locking
issue, this can avoid stuck caused by deadlock and print out log for
sysrq and oops.
Fixes: 04896a77a97b ("msm_serial: serial driver for MSM7K onboard serial peripheral.")
Signed-off-by: Leo Yan <>
Reviewed-by: Jeffrey Hugo <>
Signed-off-by: Greg Kroah-Hartman <>
Signed-off-by: Paul Gortmaker <>
diff --git a/drivers/tty/serial/msm_serial.c b/drivers/tty/serial/msm_serial.c
index 00964b6e4ac1..e0718ee5d42a 100644
--- a/drivers/tty/serial/msm_serial.c
+++ b/drivers/tty/serial/msm_serial.c
@@ -1580,6 +1580,7 @@ static void __msm_console_write(struct uart_port *port, const char *s,
int num_newlines = 0;
bool replaced = false;
void __iomem *tf;
+ int locked = 1;
if (is_uartdm)
tf = port->membase + UARTDM_TF;
@@ -1592,7 +1593,13 @@ static void __msm_console_write(struct uart_port *port, const char *s,
count += num_newlines;
- spin_lock(&port->lock);
+ if (port->sysrq)
+ locked = 0;
+ else if (oops_in_progress)
+ locked = spin_trylock(&port->lock);
+ else
+ spin_lock(&port->lock);
if (is_uartdm)
msm_reset_dm_count(port, count);
@@ -1628,7 +1635,9 @@ static void __msm_console_write(struct uart_port *port, const char *s,
iowrite32_rep(tf, buf, 1);
i += num_chars;
- spin_unlock(&port->lock);
+ if (locked)
+ spin_unlock(&port->lock);
static void msm_console_write(struct console *co, const char *s,