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printk: Check CON_SUSPEND when unblanking a console

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[ Upstream commit 72c96a2dac ]

The commit 9e70a5e109 ("printk: Add per-console suspended state")
introduced the CON_SUSPENDED flag for consoles. The suspended consoles
will stop receiving messages, so don't unblank suspended consoles
because it won't be showing anything either way.

Signed-off-by: Marcos Paulo de Souza <mpdesouza@suse.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Reviewed-by: John Ogness <john.ogness@linutronix.de>
Link: https://lore.kernel.org/r/20250226-printk-renaming-v1-5-0b878577f2e6@suse.com
Signed-off-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Marcos Paulo de Souza 2025-02-26 16:59:05 -03:00 committed by Greg Kroah-Hartman
parent 8a7f2e84f8
commit 386a1a0d55
1 changed files with 12 additions and 2 deletions
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14
kernel/printk/printk.c
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@ -3119,7 +3119,12 @@ void console_unblank(void)
*/
cookie = console_srcu_read_lock();
for_each_console_srcu(c) {
if ((console_srcu_read_flags(c) & CON_ENABLED) && c->unblank) {
short flags = console_srcu_read_flags(c);
if (flags & CON_SUSPENDED)
continue;
if ((flags & CON_ENABLED) && c->unblank) {
found_unblank = true;
break;
}
@ -3156,7 +3161,12 @@ void console_unblank(void)
cookie = console_srcu_read_lock();
for_each_console_srcu(c) {
if ((console_srcu_read_flags(c) & CON_ENABLED) && c->unblank)
short flags = console_srcu_read_flags(c);
if (flags & CON_SUSPENDED)
continue;
if ((flags & CON_ENABLED) && c->unblank)
c->unblank();
}
console_srcu_read_unlock(cookie);