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

[Corey Minyard <cminyard@mvista.com>]

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