lkml.org 
[lkml]   [2014]   [Feb]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 1/2] serial_core: Unregister console in uart_remove_one_port()
Date
From: Geert Uytterhoeven <geert+renesas@linux-m68k.org>

If the serial port being removed is used as a console, it must also be
unregistered from the console subsystem using unregister_console().

uart_ops.release_port() will release resources (e.g. iounmap() the serial
port registers), causing a crash on subsequent kernel output if the console
is still registered.

Signed-off-by: Geert Uytterhoeven <geert+renesas@linux-m68k.org>
---
drivers/tty/serial/serial_core.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index ece2049bd270..8ece7f14d89d 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -2677,6 +2677,12 @@ int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport)
tty_vhangup(port->tty);

/*
+ * If the port is used as a console, unregister it
+ */
+ if (uart_console(uport))
+ unregister_console(uport->cons);
+
+ /*
* Free the port IO and memory resources, if any.
*/
if (uport->type != PORT_UNKNOWN)
--
1.7.9.5


\
 
 \ /
  Last update: 2014-02-28 16:01    [W:0.086 / U:0.316 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site