[BUG] kacpi_notify goes into an infinite loop (luckly it calls cond_resched)

[Steven Rostedt <rostedt@goodmis.org>]

I just replaced Windows with F12 on my wife's computer, to have nothing
but issues. But anyway, one of the issues I had on this box was in
vanilla linux kernel 2.6.34 (all the fedora kernels had other issues),
the kacpi_notify would go into an infinite loop.

I debugged it a bit with ftrace and saw that the kacpi_notify workqueue
was constantly requeuing itself (thanks to the workqueue trace events).

I bisected this, and it came down to this change:

commit fa80945269f312bc609e8384302f58b03c916e12
Author: Thomas Renninger <trenn@suse.de>
Date:   Sat Feb 20 11:44:27 2010 +0100

    ACPI thermal: Don't invalidate thermal zone if critical trip point is bad


I checked out 2.6.34 again, and reverted this patch, and the problem
went away.

The box is an old Compaq Presario that I bought in 2003 or 2004.

-- Steve