GEOM probes fail on aac with EARLY_AP_STARTUP

[sthaug at nethelp.no]

> > Your issue isn't obviously directly related to mine. mps is a CAM driver
> > and aac is not (at least not for normal block volumes), which makes disk
> > probe/attach quite different.  I also don't see an obvious driver flag
> > like the one in aac.
> > 
> 
> It's a different pattern in CAM, and CAM itself looks to be safe.  MPS and MPR
> have their own intrhooks, and on review just now I see a potential for a similar
> problem to what you saw and that would match Steinar's symptoms.  Please
> try the following patch:

I have applied the patch and verified that my 11.1 server boots
nicely with this patch. However, my original problem turned out to
have a different cause (config error on my part), and thus I cannot
verify that this patch actually *fixes* a problem.

Steinar Haug, Nethelp consulting, sthaug at nethelp.no