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printk: Flush console on unregister_console()

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Ensure consoles have flushed pending records before
unregistering. The console should print up to at least its
related "console disabled" record.

Signed-off-by: John Ogness <john.ogness@linutronix.de>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20240904120536.115780-4-john.ogness@linutronix.de
Signed-off-by: Petr Mladek <pmladek@suse.com>
This commit is contained in:
John Ogness 2024-09-04 14:11:22 +02:06 committed by Petr Mladek
parent e37577ebbf
commit 0e53e2d9f7
1 changed files with 7 additions and 2 deletions
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9
kernel/printk/printk.c
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@ -3771,11 +3771,16 @@ static int unregister_console_locked(struct console *console)
if (res > 0)
return 0;
if (!console_is_registered_locked(console))
res = -ENODEV;
else if (console_is_usable(console, console->flags))
__pr_flush(console, 1000, true);
/* Disable it unconditionally */
console_srcu_write_flags(console, console->flags & ~CON_ENABLED);
if (!console_is_registered_locked(console))
return -ENODEV;
if (res < 0)
return res;
/*
* Use the driver synchronization to ensure that the hardware is not