linux-kernel - Re: [PATCH] Add the ability to layer another driver over the serial driver

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Message-ID: <457D9066.1030308@mvista.com>
Date:	Mon, 11 Dec 2006 11:07:50 -0600
From:	Corey Minyard <cminyard@...sta.com>
To:	Tilman Schmidt <tilman@...p.cc>
Cc:	Alan <alan@...rguk.ukuu.org.uk>,
	Guennadi Liakhovetski <g.liakhovetski@....de>,
	linux-serial@...r.kernel.org,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Hansjoerg Lipp <hjlipp@....de>, Russell Doty <rdoty@...hat.com>
Subject: Re: [PATCH] Add the ability to layer another driver over the serial
 driver

Tilman Schmidt wrote:
> On Mon, 11 Dec 2006 10:20:16 +0000, Alan wrote:
>   
>> This looks wrong. You already have a kernel interface to serial drivers.
>> It is called a line discipline. We use it for ppp, we use it for slip, we
>> use it for a few other things such as attaching sync drivers to some
>> devices.
>>     
>
> I was under the impression that line disciplines need a user space
> process to open the serial device and push them onto it. Is there
> a way for a driver to attach to a serial port through the line
> discipline interface from kernel space, eg. from an initialization,
> module load, or probe function?
>   
Module initialization functions run in a task context, so that's
generally not a problem.  The probe function depends on the driver,
I guess, but most I have seen are in task context.

-Corey

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