cvs commit: src/sys/dev/fxp if_fxp.c

[Sam Leffler]

I believe this also makes things work for bridging (and other similar 
"middle ware" which may cause start to be entered directly from a recv. 
However my approach to dealing with this problem in other drivers was to 
use two different locks, one for the xmit side and one for the recv side. 
I'm not certain what I've done handles everything but it certainly 
eliminates the up-down locking per-packet that's required if you stick to 
one lock.

	Sam