Commit 7e537af9 authored by John Ogness's avatar John Ogness Committed by Petr Mladek
Browse files

tty: serial: kgdboc: use srcu console list iterator 



Use srcu console list iteration for safe console list traversal.
Note that this is a preparatory change for when console_lock no
longer provides synchronization for the console list.

Signed-off-by: default avatarJohn Ogness <john.ogness@linutronix.de>
Reviewed-by: default avatarPetr Mladek <pmladek@suse.com>
Reviewed-by: default avatarDouglas Anderson <dianders@chromium.org>
Signed-off-by: default avatarPetr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20221116162152.193147-36-john.ogness@linutronix.de
parent 28de287a

drivers/tty/serial/kgdboc.c

+8 −2
Original line number Diff line number Diff line
@@ -451,6 +451,7 @@ static void kgdboc_earlycon_pre_exp_handler(void) 
{

	struct console *con;

	static bool already_warned;

	int cookie;



	if (already_warned)

		return;
@@ -463,8 +464,13 @@ static void kgdboc_earlycon_pre_exp_handler(void) 
	 * serial drivers might be OK with this, print a warning once per

	 * boot if we detect this case.

	 */

	for_each_console(con)

	cookie = console_srcu_read_lock();

	for_each_console_srcu(con) {

		if (con == kgdboc_earlycon_io_ops.cons)

			break;

	}

	console_srcu_read_unlock(cookie);

	if (con)

		return;



	already_warned = true;