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printk: nbcon: Check for device_{lock,unlock} callbacks

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These callbacks are necessary to synchronize ->write_thread callback
against other operations using the same device.

Signed-off-by: Marcos Paulo de Souza <mpdesouza@suse.com>
Reviewed-by: John Ogness <john.ogness@linutronix.de>
Link: https://patch.msgid.link/20251208-nbcon-device-cb-fix-v2-1-36be8d195123@suse.com
Signed-off-by: Petr Mladek <pmladek@suse.com>
This commit is contained in:
Marcos Paulo de Souza
2025-12-08 11:06:16 -03:00
committed by Petr Mladek
parent 4d38b88fd1
commit bdfcca65e7
1 changed files with 5 additions and 2 deletions
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7
kernel/printk/nbcon.c
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@@ -1760,9 +1760,12 @@ bool nbcon_alloc(struct console *con)
/* Synchronize the kthread start. */
lockdep_assert_console_list_lock_held();
/* The write_thread() callback is mandatory. */
if (WARN_ON(!con->write_thread))
/* Check for mandatory nbcon callbacks. */
if (WARN_ON(!con->write_thread ||
!con->device_lock ||
!con->device_unlock)) {
return false;
}
rcuwait_init(&con->rcuwait);
init_irq_work(&con->irq_work, nbcon_irq_work);