From owner-freebsd-current  Mon Mar  4 13:48:17 2002
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Date: Mon, 04 Mar 2002 13:47:25 -0800
From: Maksim Yevmenkin <myevmenk@digisle.net>
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To: Julian Elischer <julian@elischer.org>
Cc: freebsd-current@FreeBSD.ORG, archie@FreeBSD.ORG
Subject: Re: Netgraph, device drivers and mutexes
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Julian,

[...]

> > > I hope that this helps you!
> >
> > yes it did help :) i changed my code and it seems to work just fine.
> > i wish i had SMP laptop to test it :)
> 
> Well it aint exactly SMP safe YET, until I make those changes through teh
> REST of the system. There are still direct timeout() calls in several
> modules that I need to change to follow my own suggestions and there are
> many nodes that need to be changed to gain a lock when they first
> try insert data into the graph. e.g. ng_tty, ng_ether,

speaking of ng_tty... it is clear to me how to inject data into Netgraph
in a safe way, but it is not yet clear how Netgraph can inject data into
other subsystems.

you see, the Bluetooth spec defines several Host (PC) to Host Controller
(Bluetooth unit) communication protocols. one of them is UART transport
layer (AKA H4). i have implemented H4 line discipline that also a
Netgraph
node. (i called it ng_sio in my report but it was wrong). it works now,
and i can talk to Xircom card, but it should be changed later. any
hints?
 
thanks,
max

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