Power management fixes for 3.9-rc7

- System reboot/halt fix related to CPU offline ordering
  from Huacai Chen.

- intel_pstate driver fix for a delay time computation error
  occasionally crashing systems using it from Dirk Brandewie.

/
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.0.19 (GNU/Linux)

iQIcBAABAgAGBQJRZynOAAoJEKhOf7ml8uNsYWcQAIZIps7Ivn2+r3ENL+jhTohx
ErEz/cu/YIS/TnDzO3GO+Yo9CcXjUebMWqefIC//YK/K+tNepVOLovthTGiA/X36
23RDRrF1hqZlEgiEfFpuXiyq9u33CbUCYt75tsBXhxJkxeG7J7JfiG4AUh8dED4B
nUCbQ4jWM7r9DYJFl2gjDkFt1SjG/UbxcN9Kua9v4zfJil9fKp9093HHYBHH3a2n
zXlAE7CskXrNOepwp9Efzu5uPU3gbkIiQdKxvUs91remAcZ3fMsbz8CerZlgfy1S
+3f4AuU9i2AXeYI5fanhLo6Mwm8jqBvZ8ZE4Fh/EuQs9eHk7VuRsy7n22zaVeU0A
efaldd/pdP7KbSv5Wrs8adQr3GcRHkuHnMGhTlp41tfR8gJfpZUrK3/6h/jnIPRC
1UnBAF4K67v85fBO6gnC8UhEp3MXXXZoPtPByGILxj34KVn+oHzrVgE+8+ugv7HM
ZJ5jobYPWrxI2lZv5kuBdHCVg2TAC3YUz2aev8cEhIo4vdcIC2cofVDyAcN9ArqF
aF6fcNr6Rgu/M6bB2bP/zbhmDApr8H8z952jss51gprJ+IiKNUh9daiFnYw+o391
9VVTolC7k6P4pXTbtgqEFDLTJ0dKD8i/J4RLHwIsX7jzVgLctyqKZsNXskovjH4p
jqIxu/1SPxR2dtBziUEH
=bkFT
-----END PGP SIGNATURE-----
PM / reboot: call syscore_shutdown() after disable_nonboot_cpus()

As commit 40dc166c (PM / Core: Introduce struct syscore_ops for core
subsystems PM) say, syscore_ops operations should be carried with one
CPU on-line and interrupts disabled. However, after commit f96972f2d
(kernel/sys.c: call disable_nonboot_cpus() in kernel_restart()),
syscore_shutdown() is called before disable_nonboot_cpus(), so break
the rules. We have a MIPS machine with a 8259A PIC, and there is an
external timer (HPET) linked at 8259A. Since 8259A has been shutdown
too early (by syscore_shutdown()), disable_nonboot_cpus() runs without
timer interrupt, so it hangs and reboot fails. This patch call
syscore_shutdown() a little later (after disable_nonboot_cpus()) to
avoid reboot failure, this is the same way as poweroff does.

For consistency, add disable_nonboot_cpus() to kernel_halt().

Signed-off-by: Huacai Chen <chenhc@lemote.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
1 file changed