linux-kernel - Re: [PATCH printk v3 22/40] console: introduce console_is

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Message-ID: <Y2z19STrTZj+nDhj@alley>
Date:   Thu, 10 Nov 2022 14:00:37 +0100
From:   Petr Mladek <pmladek@...e.com>
To:     John Ogness <john.ogness@...utronix.de>
Cc:     Sergey Senozhatsky <senozhatsky@...omium.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH printk v3 22/40] console: introduce
 console_is_registered()

On Mon 2022-11-07 15:22:20, John Ogness wrote:
> Currently it is not possible for drivers to detect if they have
> already successfully registered their console. Several drivers
> have multiple paths that lead to console registration. To avoid
> attempting a 2nd registration (which leads to a WARN), drivers
> are implementing their own solution.
> 
> Introduce console_is_registered() so drivers can easily identify
> if their console is currently registered. A _locked() variant
> is also provided if the caller is already holding the
> console_list_lock.
> 
> Signed-off-by: John Ogness <john.ogness@...utronix.de>

Reviewed-by: Petr Mladek <pmladek@...e.com>

Best Regards,
Petr