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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