linux-kernel - Re: [PATCH 2/2] serial: 8250: Fix runtime PM for start

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Message-ID: <YlQD/gvwYp+cJxX9@atomide.com>
Date:   Mon, 11 Apr 2022 13:33:34 +0300
From:   Tony Lindgren <tony@...mide.com>
To:     Johan Hovold <johan@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andy Shevchenko <andriy.shevchenko@...el.com>,
        Jiri Slaby <jirislaby@...nel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-serial@...r.kernel.org, linux-omap@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Steffen Trumtrar <s.trumtrar@...gutronix.de>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        "Matwey V. Kornilov" <matwey@....msu.ru>
Subject: Re: [PATCH 2/2] serial: 8250: Fix runtime PM for start_tx() for
 empty buffer

* Johan Hovold <johan@...nel.org> [220411 10:10]:
> On Mon, Apr 11, 2022 at 12:48:05PM +0300, Tony Lindgren wrote:
> > diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
> > --- a/drivers/tty/serial/8250/8250_port.c
> > +++ b/drivers/tty/serial/8250/8250_port.c
> > @@ -1677,8 +1677,10 @@ static void serial8250_start_tx(struct uart_port *port)
> >  
> >  	serial8250_rpm_get_tx(up);
> >  
> > -	if (!port->x_char && uart_circ_empty(&port->state->xmit))
> > +	if (!port->x_char && uart_circ_empty(&port->state->xmit)) {
> > +		serial8250_rpm_put_tx(up);
> >  		return;
> > +	}
> 
> Move this before the runtime pm get instead?

Yup good idea.

Tony