linux-kernel - Re: [PATCH 3/3] tty: serial: Check UPF_FOURPORT, when CONFIG_SERIAL_8250

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Date:	Fri, 11 Mar 2011 13:55:02 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@...esas.com>
Cc:	gregkh@...e.de, linux-kernel@...r.kernel.org, arnd@...db.de
Subject: Re: [PATCH 3/3] tty: serial: Check UPF_FOURPORT, when
 CONFIG_SERIAL_8250_FOURPORT is defined

On Fri, 11 Mar 2011 21:58:12 +0900
Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@...esas.com> wrote:

> When CONFIG_SERIAL_8250_FOURPORT is defined, driver uses UPF_FOURPORT in port.flags.
> Though CONFIG_SERIAL_8250_FOURPORT is not defined, there is a case to check UPF_FOURPORT.
> When CONFIG_SERIAL_8250_FOURPORT is defined only, this checks UPF_FOURPORT.

Again all this can be avoided by defining WARN traps for the unsupported
I/O methods in your architecture.

Alan
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