[PATCH] ppbus/ppc locking

[Bruce M. Simpson]

John Baldwin wrote:
> Please test!  This is the last non-MPSAFE network driver at this point.  This 
> patch adds locking for the ppbus(4)/ppc(4) devices and the various ppbus 
> child devices (lpt, vpo, lpbb, ppi, pps).  The basic model is that a single 
> mutex in the ppc(4) driver protects the ppc0 hardware and is shared with the 
> various child drivers.  Two drivers now have detach methods that did not have 
> them before (plip and ppi).  I've done some simple testing on my laptop (able 
> to load the drivers and do some simple things w/o panic'ing or tripping 
> assertions), but I am not really able to test the peripheral drivers fully.
>
> http://www.FreeBSD.org/~jhb/patches/ppc_locking.patch
>
>   

Runway lpt Giant is an occasionally show stopping issue for me because 
my printer is attached via the plt port.  I may get time to look at this 
later on...

I tried applying these patches against 7-STABLE.

ppc_cleanup.patch applied OK to 7.

ppc_intr.patch applied OK to 7 with interrupt.h change manually merged,
and some fixups to ppc.c for earlier intr_event kpi.

ppc_locking.patch does not apply cleanly, and it's too much for me to 
deal with right now.

I found I had to hack up an existing 7 tree in /usr/src to get things to 
compile because of the wide scope of the changes (touching kern, sys 
etc), I couldn't just use an svn checkout to work from.

cheers
BMS