linux-kernel - Re: serial 00:06: Runtime PM usage count underflow!

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] [day] [month] [year] [list]

Message-ID: <20241210151713.GIZ1hbeSzdnQEqei8J@fat_crate.local>
Date: Tue, 10 Dec 2024 16:17:13 +0100
From: Borislav Petkov <bp@...en8.de>
To: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc: linux-serial <linux-serial@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jirislaby@...nel.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: serial 00:06: Runtime PM usage count underflow!

On Mon, Nov 18, 2024 at 04:14:20PM +0200, Ilpo Järvinen wrote:
> I think "Runtime PM usage count underflow!" is not related to the probe 
> problem you're seeing. Nonetheless, this patch might solve the underflow:
> 
> --
> [PATCH 1/1] tty: serial: 8250: Fix another runtime PM usage counter underflow
> 
> The commit f9b11229b79c ("serial: 8250: Fix PM usage_count for console
> handover") fixed one runtime PM usage counter balance problem that
> occurs because .dev is not set during univ8250 setup preventing call to
> pm_runtime_get_sync(). Later, univ8250_console_exit() will trigger the
> runtime PM usage counter underflow as .dev is already set at that time.
> 
> Call pm_runtime_get_sync() to balance the RPM usage counter also in
> serial8250_register_8250_port() before trying to add the port.
> 
> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>

Reported-by: Borislav Petkov (AMD) <bp@...en8.de>
Tested-by: Borislav Petkov (AMD) <bp@...en8.de>

Thx!

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette