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Date: Mon, 7 Nov 2022 15:22:00 +0106 From: John Ogness <john.ogness@...utronix.de> To: Petr Mladek <pmladek@...e.com> Cc: Sergey Senozhatsky <senozhatsky@...omium.org>, Steven Rostedt <rostedt@...dmis.org>, Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org, Jason Wessel <jason.wessel@...driver.com>, Daniel Thompson <daniel.thompson@...aro.org>, Douglas Anderson <dianders@...omium.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Jiri Slaby <jirislaby@...nel.org>, kgdb-bugreport@...ts.sourceforge.net, linux-serial@...r.kernel.org Subject: [PATCH printk v3 02/40] serial: kgdboc: Lock console list in probe function From: Thomas Gleixner <tglx@...utronix.de> Unprotected list walks are not necessarily safe. Signed-off-by: Thomas Gleixner <tglx@...utronix.de> Signed-off-by: John Ogness <john.ogness@...utronix.de> Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Reviewed-by: Douglas Anderson <dianders@...omium.org> Reviewed-by: Sergey Senozhatsky <senozhatsky@...omium.org> Reviewed-by: Petr Mladek <pmladek@...e.com> --- drivers/tty/serial/kgdboc.c | 2 ++ 1 file changed, 2 insertions(+) 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; -- 2.30.2
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