linux-kernel - RE: [PATCH] printk: nbcon: check uart port is nbcon or not in nbcon

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Date: Tue, 23 Jan 2024 03:05:49 +0000
From: "Chang, Junxiao" <junxiao.chang@...el.com>
To: John Ogness <john.ogness@...utronix.de>, Sebastian Andrzej Siewior
	<bigeasy@...utronix.de>
CC: "tglx@...utronix.de" <tglx@...utronix.de>, "rostedt@...dmis.org"
	<rostedt@...dmis.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "Li, Hao3" <hao3.li@...el.com>, "Li, Lili"
	<lili.li@...el.com>, "Gao, Jianfeng" <jianfeng.gao@...el.com>,
	"linux-rt-users@...r.kernel.org" <linux-rt-users@...r.kernel.org>
Subject: RE: [PATCH] printk: nbcon: check uart port is nbcon or not in
 nbcon_release

Your idea makes sense. We tried to implement a new patch according to your idea, it could fix our booting hang problem. We will push patch for review soon. BTW, it is better to have " uart_is_nbcon " checking in nbcon_release as well as it in nbcon_acquire. 😊 Two patches will be pushed together for review.

> We could move the @locked_port flag to the struct uart_port. (Probably renaming it to @nbcon_locked_port.) I think that would be the appropriate fix.

> John