diff mbox series

[printk,v3,02/40] serial: kgdboc: Lock console list in probe function

Message ID 20221107141638.3790965-3-john.ogness@linutronix.de
State New
Headers
Series reduce console_lock scope |

Commit Message

John Ogness Nov. 7, 2022, 2:16 p.m. UTC 
  From: Thomas Gleixner <tglx@linutronix.de>

Unprotected list walks are not necessarily safe.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: John Ogness <john.ogness@linutronix.de>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Reviewed-by: Petr Mladek <pmladek@suse.com>
---
 drivers/tty/serial/kgdboc.c | 2 ++
 1 file changed, 2 insertions(+)

Comments

Daniel Thompson Nov. 9, 2022, 8:20 a.m. UTC | #1 
On Mon, Nov 07, 2022 at 03:22:00PM +0106, John Ogness wrote:
> From: Thomas Gleixner <tglx@linutronix.de>
>
> Unprotected list walks are not necessarily safe.
>
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> Signed-off-by: John Ogness <john.ogness@linutronix.de>
> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Reviewed-by: Douglas Anderson <dianders@chromium.org>
> Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org>
> Reviewed-by: Petr Mladek <pmladek@suse.com>

Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>


Daniel.
diff mbox series

Patch

diff --git a/drivers/tty/serial/kgdboc.c b/drivers/tty/serial/kgdboc.c
index 7aa37be3216a..e76f0186c335 100644
--- a/drivers/tty/serial/kgdboc.c
+++ b/drivers/tty/serial/kgdboc.c
@@ -193,6 +193,7 @@  static int configure_kgdboc(void)
 	if (!p)
 		goto noconfig;
 
+	console_lock();
 	for_each_console(cons) {
 		int idx;
 		if (cons->device && cons->device(cons, &idx) == p &&
@@ -201,6 +202,7 @@  static int configure_kgdboc(void)
 			break;
 		}
 	}
+	console_unlock();
 
 	kgdb_tty_driver = p;
 	kgdb_tty_line = tty_line;