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tty: serial: kgdboc: use srcu console list iterator

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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: John Ogness <john.ogness@linutronix.de>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20221116162152.193147-36-john.ogness@linutronix.de
This commit is contained in:
John Ogness 2022-11-16 17:27:47 +01:06 committed by Petr Mladek
parent 28de287a95
commit 7e537af997
1 changed files with 8 additions and 2 deletions
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10
drivers/tty/serial/kgdboc.c
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@ -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;
@ -463,9 +464,14 @@ 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)
return;
break;
}
console_srcu_read_unlock(cookie);
if (con)
return;
already_warned = true;
pr_warn("kgdboc_earlycon is still using bootconsole\n");