linux-kernel - Re: [PATCHv2] serial: 8250: Fix runtime PM for start

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Message-ID: <20220411121424.7pc3jjsqglxbfakt@pengutronix.de>
Date:   Mon, 11 Apr 2022 14:14:24 +0200
From:   Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To:     Tony Lindgren <tony@...mide.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andy Shevchenko <andriy.shevchenko@...el.com>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        Jiri Slaby <jirislaby@...nel.org>,
        Johan Hovold <johan@...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>
Subject: Re: [PATCHv2] serial: 8250: Fix runtime PM for start_tx() for empty
 buffer

On Mon, Apr 11, 2022 at 02:16:57PM +0300, Tony Lindgren wrote:
> Commit 932d596378b0 ("serial: 8250: Return early in .start_tx() if there
> are no chars to send") caused a regression where the drivers implementing
> runtime PM stopped idling. This is because serial8250_rpm_put_tx() is now
> unbalanced on early return, it normally gets called at __stop_tx().
> 
> Fixes: 932d596378b0 ("serial: 8250: Return early in .start_tx() if there are no chars to send")
> Cc: Steffen Trumtrar <s.trumtrar@...gutronix.de>
> Cc: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
> Signed-off-by: Tony Lindgren <tony@...mide.com>

Reviewed-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>

Thanks for cleaning up behind me,
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |

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