linux-kernel - Re: [PATCH] serial: 8250: Clear port->pm on port specific driver unbind

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Date:   Fri, 14 Apr 2023 08:47:26 +0300
From:   Tony Lindgren <tony@...mide.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        Johan Hovold <johan@...nel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-omap@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] serial: 8250: Clear port->pm on port specific driver
 unbind

* Andy Shevchenko <andriy.shevchenko@...ux.intel.com> [230413 16:06]:
> On Thu, Apr 13, 2023 at 10:03:41AM +0300, Tony Lindgren wrote:
> > Let's fix the issue by clearing port->pm in serial8250_unregister_port().
> 
> Sounds to me like a fix that needs a Fixes tag.

Maybe commit c161afe9759d ("8250: allow platforms to override PM hook.").

That's a bit unclear though as the hardware specific functions were
available at that point as they were passed in platform data. This can
be seen with git blame c161afe9759d drivers/serial/8250.c. To me it seems
the port->pm became potentially invalid if a serial port device driver
started implementing PM runtime?

Maybe just tagging it with Cc: stable is better if no obvious Fixes tag
can be figured out.

> Code wise LGTM,
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

OK thanks,

Tony