linux-kernel - Re: [PATCH v5 5/7] serial: core, imx: do not set RS485 enabled if it is not supported

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Message-ID: <fb579fd-a5ae-2838-d1b-eefc16ad015@linux.intel.com>
Date:   Thu, 14 Dec 2023 11:27:03 +0200 (EET)
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     Lino Sanfilippo <LinoSanfilippo@....de>
cc:     Lino Sanfilippo <l.sanfilippo@...bus.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        u.kleine-koenig@...gutronix.de, shawnguo@...nel.org,
        s.hauer@...gutronix.de, mcoquelin.stm32@...il.com,
        alexandre.torgue@...s.st.com, cniedermaier@...electronics.com,
        hugo@...ovil.com, LKML <linux-kernel@...r.kernel.org>,
        linux-serial <linux-serial@...r.kernel.org>,
        Lukas Wunner <lukas@...ner.de>, p.rosenberger@...bus.com,
        stable@...r.kernel.org
Subject: Re: [PATCH v5 5/7] serial: core, imx: do not set RS485 enabled if
 it is not supported

On Wed, 13 Dec 2023, Lino Sanfilippo wrote:
> On 11.12.23 12:00, Ilpo Järvinen wrote:
> > On Sat, 9 Dec 2023, Lino Sanfilippo wrote:
> 
> > Looking into the code, that setting of rs485_supported from imx_no_rs485
> > is actually superfluous as it should be already cleared to zeros on alloc.
> >
> 
> Yes. BTW: Another "no_rs485" configuration setting can be found in the ar933x driver.
> If we do not want to keep those assignments I can remove the one for the imx
> driver with the next version of this patch...

I think they can just be dropped as it's normal in Linux code to assume 
that things are zeroed by default. Those "no"-variants originate from the 
time when supported_rs485 was not yet embedded but just a pointer to a 
const struct and I didn't realize I could have removed them when I ended 
up embedding the struct so it can be altered per port.

-- 
 i.