Received-SPF: pass (google.com: domain of linux-kernel+bounces-168741-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.199.223 as permitted sender) client-ip=147.75.199.223;
Date: Sat, 4 May 2024 18:08:31 +0200
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: John Ogness <john.ogness@linutronix.de>
Cc: Petr Mladek <pmladek@suse.com>,
	Sergey Senozhatsky <senozhatsky@chromium.org>,
	Steven Rostedt <rostedt@goodmis.org>,
	Thomas Gleixner <tglx@linutronix.de>, linux-kernel@vger.kernel.org,
	Jiri Slaby <jirislaby@kernel.org>, linux-serial@vger.kernel.org
Subject: Re: [PATCH printk v5 12/30] serial: core: Implement processing in
 port->lock wrapper
Message-ID: <2024050424-agony-document-677c@gregkh>
References: <20240502213839.376636-1-john.ogness@linutronix.de>
 <20240502213839.376636-13-john.ogness@linutronix.de>
Precedence: bulk
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20240502213839.376636-13-john.ogness@linutronix.de>

On Thu, May 02, 2024 at 11:44:21PM +0206, John Ogness wrote:
> Currently the port->lock wrappers uart_port_lock(),
> uart_port_unlock() (and their variants) only lock/unlock
> the spin_lock.
> 
> If the port is an nbcon console, the wrappers must also
> acquire/release the console and mark the region as unsafe. This
> allows general port->lock synchronization to be synchronized
> with the nbcon console ownership.
> 
> Note that __uart_port_using_nbcon() relies on the port->lock
> being held while a console is added and removed from the
> console list (i.e. all uart nbcon drivers *must* take the
> port->lock in their device_lock() callbacks).
> 
> Signed-off-by: John Ogness <john.ogness@linutronix.de>
> ---
>  include/linux/serial_core.h | 82 ++++++++++++++++++++++++++++++++++++-
>  1 file changed, 80 insertions(+), 2 deletions(-)

Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>