linux-kernel - Re: [PATCH v7 4/6] serial: take termios_rwsem for .rs485

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Message-ID: <ddc178b-1292-248c-21a1-4cf990d0b1c@linux.intel.com>
Date:   Thu, 16 Jun 2022 08:15:16 +0300 (EEST)
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
cc:     linux-serial <linux-serial@...r.kernel.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Vladimir Zapolskiy <vz@...ia.com>,
        Russell King <linux@...linux.org.uk>,
        Richard Genoud <richard.genoud@...il.com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-arm-kernel@...ts.infradead.org,
        linux-stm32@...md-mailman.stormreply.com,
        Lukas Wunner <lukas@...ner.de>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Lino Sanfilippo <LinoSanfilippo@....de>
Subject: Re: [PATCH v7 4/6] serial: take termios_rwsem for .rs485_config()
 & pass termios as param

On Wed, 15 Jun 2022, Andy Shevchenko wrote:

> On Wed, Jun 15, 2022 at 03:48:27PM +0300, Ilpo Järvinen wrote:
> > To be able to alter ADDRB within .rs485_config(), take termios_rwsem
> > before calling .rs485_config() and pass termios.
> 
> I would use ->rs485_config() as a reference to the callback.
> 
> ...
> 
> > -	ret = port->rs485_config(port, rs485);
> > +	ret = port->rs485_config(port, rs485, NULL);
> 
> > +
> 
> Stray change?

Yes it was.

> >  	if (ret)
> >  		memset(rs485, 0, sizeof(*rs485));
> 
> ...
> 
> >  	void			(*handle_break)(struct uart_port *);
> >  	int			(*rs485_config)(struct uart_port *,
> > -						struct serial_rs485 *rs485);
> > +						struct serial_rs485 *rs485,
> > +						struct ktermios *termios);
> 
> Dunno if termios has to be second parameter. The idea is to pass input data
> followed by (auxiliary) output as usual pattern.

I guess I can make termios 2nd param.

-- 
 i.