linux-kernel - Re: [PATCH v2] printk: nbcon: Check for device

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Message-ID: <878qfdvxi7.fsf@jogness.linutronix.de>
Date: Mon, 08 Dec 2025 15:56:08 +0106
From: John Ogness <john.ogness@...utronix.de>
To: Marcos Paulo de Souza <mpdesouza@...e.com>, Petr Mladek
 <pmladek@...e.com>, Steven Rostedt <rostedt@...dmis.org>, Sergey
 Senozhatsky <senozhatsky@...omium.org>
Cc: linux-kernel@...r.kernel.org, marcos@...esouza.com, Marcos Paulo de
 Souza <mpdesouza@...e.com>
Subject: Re: [PATCH v2] printk: nbcon: Check for device_{lock,unlock} callbacks

On 2025-12-08, Marcos Paulo de Souza <mpdesouza@...e.com> wrote:
> These callbacks are necessary to synchronize ->write_thread callback
> against other operations using the same device.
>
> Signed-off-by: Marcos Paulo de Souza <mpdesouza@...e.com>
> ---
> I found this issue while creating a custom kernel module that implements
> the nbcon interfaces.
> ---
> Changes in v2:
> - Merged the checks device locks with write_thread check, suggested by John.
> - Link to v1: https://patch.msgid.link/20251205-nbcon-device-cb-fix-v1-1-906bdff5760b@suse.com
> ---

Thanks!

Reviewed-by: John Ogness <john.ogness@...utronix.de>