linux-kernel - RE: [BUG] Suspend failure with nbcon + pm_debug

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID:
 <DB9PR04MB8429F50811DDC648DD8A7B8792C4A@DB9PR04MB8429.eurprd04.prod.outlook.com>
Date: Tue, 4 Nov 2025 10:43:18 +0000
From: Sherry Sun <sherry.sun@....com>
To: John Ogness <john.ogness@...utronix.de>, "esben@...nix.com"
	<esben@...nix.com>, "pmladek@...e.com" <pmladek@...e.com>,
	"senozhatsky@...omium.org" <senozhatsky@...omium.org>, "tglx@...utronix.de"
	<tglx@...utronix.de>, Greg KH <gregkh@...uxfoundation.org>, Jiri Slaby
	<jirislaby@...nel.org>, Shawn Guo <shawnguo@...nel.org>, Sascha Hauer
	<s.hauer@...gutronix.de>, "ryotkkr98@...il.com" <ryotkkr98@...il.com>,
	"kkartik@...dia.com" <kkartik@...dia.com>, "fj6611ie@...jp.fujitsu.com"
	<fj6611ie@...jp.fujitsu.com>
CC: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, linux-serial
	<linux-serial@...r.kernel.org>, "imx@...ts.linux.dev" <imx@...ts.linux.dev>,
	Pengutronix Kernel Team <kernel@...gutronix.de>, "linux-pm@...r.kernel.org"
	<linux-pm@...r.kernel.org>
Subject: RE: [BUG] Suspend failure with nbcon + pm_debug_messages (Linux
 6.18-rc4)

> On 2025-11-04, Sherry Sun <sherry.sun@....com> wrote:
> >> Thanks for reporting! I believe this is the same issue reported by
> >> NVIDIA [0] when we tried to switch the 8250 UART driver to nbcon.
> >>
> >> We have been working with NVIDIA recently to address the issue. There
> >> is a patch [1] we are currently testing that looks good so far. It is
> >> based on 6.17 but should work fine for 6.18-rc4 as well. Can you give it a
> spin?
> >
> > Thanks a lot for your quick reply, I just tried the patch [1] on my
> > i.MX8MP EVK with L6.18-rc4, it does fix the suspend issue.  Now i.MX
> > UART nbcon can enter suspend with `pm_debug_messages` is turned on.
> > May I know what is the upstream plan for the patch [1]?
> 
> Thanks for confirming the fix. I will make an official post on LKML with the
> patch today. Since the i.MX nbcon-driver is already mainline, I will CC stable. I
> will CC you as well.
> 
> Note that the patch still needs a formal review from the printk folks once it
> hits LKML.
> 

Hi John, got it.
I'll keep an eye on any fixes you send later and verify them if necessary. Hope this fix can be applied to the mainline and the stable tree ASAP.

Best Regards
Sherry