linux-kernel - Re: [PATCH 1/3] tty/serial_core: add ISO7816 infrastructure

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Message-ID: <20180719120705.4a2fde04@alans-desktop>
Date:   Thu, 19 Jul 2018 12:07:05 +0100
From:   Alan Cox <gnomes@...rguk.ukuu.org.uk>
To:     Ludovic Desroches <ludovic.desroches@...rochip.com>
Cc:     Greg KH <gregkh@...uxfoundation.org>,
        <linux-serial@...r.kernel.org>, <linux-arch@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <jslaby@...e.com>,
        <arnd@...db.de>, <richard.genoud@...il.com>,
        <nicolas.ferre@...rochip.com>, <alexandre.belloni@...tlin.com>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] tty/serial_core: add ISO7816 infrastructure

> >   
> > > +	if (!port->iso7816_config)
> > > +		return -ENOIOCTLCMD;  
> > 
> > Why this error value?
> >   
> 
> It was a mimic of RS485.

Which is what you want - it means the upper tty layer knows to offer the
ioctl to other places and then return appropriately.

Alan