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

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Message-ID: <20230418094123.GA14287@atomide.com>
Date:   Tue, 18 Apr 2023 12:41:23 +0300
From:   Tony Lindgren <tony@...mide.com>
To:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Johan Hovold <johan@...nel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-omap@...r.kernel.org,
        linux-serial <linux-serial@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] serial: 8250: Clear port->pm on port specific driver
 unbind

* Tony Lindgren <tony@...mide.com> [230414 09:40]:
> I'm now wondering still if we should clear all the conditional hardware
> specific functions too in addition to port->pm that get set in
> serial8250_register_8250_port(). Maybe best done in a separate patch
> as needed.. Any suggestions?

Well we can't do memset on the port for sure at this point.. But what
we can do is call serial8250_set_defaults() instead of clearing just
port->pm. This will set the port back to serial8250 default functions,
and will set port->pm too.

I'll send v2 patch after some more testing.

Regards,

Tony