Re: lpt stopped working

On Monday 09 February 2009, John Baldwin wrote:
> On Friday 06 February 2009 4:31:46 pm Beech Rintoul wrote:
> > On Thursday 05 February 2009 22:03:37 Beech Rintoul wrote:
> > > On Wednesday 04 February 2009 05:14:10 John Baldwin wrote:
> > > > On Monday 02 February 2009 10:43:39 am Christian Gusenbauer wrote:
> > > > > Hi!
> > > > >
> > > > > Since the recent update (svn r187576) to the ppbus/ppc code my
> > > > > printer
> > > >
> > > > stopped
> > > >
> > > > > working. Every request seems to hang forever in ppb_request_bus
> > > > > waiting for ppb->ppc_lock (at least 'top' tells me that it's
> > > > > hanging in state 'ppbreq').
> > > >
> > > > Can you use procstat to get a stack trace of the hung thread?
> > >
> > > My printer is still showing "device busy" for lpt0 does anyone know
> > > offhand when the changes were committed? I need to revert.
> >
> > There is regression somewhere in the ppbus code committed two weeks ago.
> > I reverted back to previous code and lpt0 no longer reports "device busy"
> > and printing is working again.
>
> Please help to debug this so we can have working lpt0 in 8.0.  No one
> tested the patches months ago when I first posted them, and if folks do not
> test them now I will simply remove the driver before 8.0 ships.  I no

Mea culpa, too. As you sent your patches, I thought someone else will do the 
tests surely ... :-(.

> longer have any hardware such that I can test this directly, so I am
> depending on folks to test things I have asked for and report back.  I
> believe the last thing I asked for was for someone to do this when they lpt
> was hung:
>
> Ok, can you run kgdb against your running kernel (Just run 'kgdb' without
> any arguments) and do the following:
>
> (kgdb) p *(struct ppb_data *)ppbus_devclass->devices[0]->softc
>
> Assuming the ppb_owner is not 0, can you then do this:
>
> (kgdb) p *(device_t)((struct ppb_data
> *)ppbus_devclass->devices[0]->softc)->ppb_owner

This is the output (unfortunately ppb_owner IS 0):

(kgdb) p *(struct ppb_data *)ppbus_devclass->devices[0]->softc
$1 = {class_id = 10, state = 1, error = 0, mode = 0, ppb_owner = 0x0,
  ppc_lock = 0xc56bfe7c, ppc_irq_res = 0xc573d5c0}

Christian.