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Message-ID: <Y20VNMu1VCW2qP13@frostfish>
Date: Thu, 10 Nov 2022 15:13:56 +0000
From: Daniel Thompson <daniel.thompson@...aro.org>
To: John Ogness <john.ogness@...utronix.de>
Cc: Petr Mladek <pmladek@...e.com>,
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>,
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: Re: [PATCH printk v3 37/40] tty: serial: kgdboc: synchronize
tty_find_polling_driver() and register_console()
On Mon, Nov 07, 2022 at 03:22:35PM +0106, John Ogness wrote:
> Calling tty_find_polling_driver() can lead to uart_set_options() being
> called (via the poll_init() callback of tty_operations) to configure the
> uart. But uart_set_options() can also be called by register_console()
> (via the setup() callback of console).
>
> Take the console_list_lock to synchronize against register_console() and
> also use it for console list traversal. This also ensures the console list
> cannot change until the polling console has been chosen.
>
> Signed-off-by: John Ogness <john.ogness@...utronix.de>
Reviewed-by: Daniel Thompson <daniel.thompson@...aro.org>
Daniel.
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