Tracking down ata0 reset hang

[Kevin Oberman]

> Date: Thu, 11 Dec 2003 13:13:15 -0800 (PST)
> From: Nate Lawson <nate at root.org>
> Sender: owner-freebsd-current at freebsd.org
> 
> I have a laptop that suspends and resumes fine.  Soeren's patch to
> properly reset the hardware after the ATAng import fixed the problem where
> resuming would hang in ata0 reset with the hard drive light on.
> 
> Sometime in the last month or two, the ATA reset phase of resume has begun
> hanging again with the drive light on and I can't break to the debugger.
> The interesting data point is that if I suspend/resume in single user
> mode, it works fine, including the reset.  But in multi-user mode, it
> hangs.  I'm trying to disable various services to see if any of them
> triggers the hang.
> 
> Has anyone else seen this regression?

I see it, but it's not a regression for me. Ever since ATAng was merged
into HEAD, I've had this problem and Soeren's patch did not seem to
help.

I have not tried suspending in stand-alone mode, but I will give it a
try a little later today.
-- 
R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: oberman at es.net			Phone: +1 510 486-8634