tree 1848b0bb729372a03c395d11491497dd549e3a98
parent 8bcad30f2e6d4c20f7e71d2e2ac77acc0f0931e5
author Andreas Herrmann <andreas.herrmann3@amd.com> 1224064313 +0200
committer Ingo Molnar <mingo@elte.hu> 1224669610 +0200

x86: SB600: skip IRQ0 override if it is not routed to INT2 of IOAPIC

Impact: fix hung bootup and other misbehavior on certain laptops

On some more HP laptops BIOS reports an IRQ0 override
but the SB600 chipset is configured such that timer
interrupts go to INT0 of IOAPIC.

Check IRQ0 routing and if it is routed to INT0 of IOAPIC skip the
timer override.

See following bug reports:

  http://bugzilla.kernel.org/show_bug.cgi?id=11715
  http://bugzilla.kernel.org/show_bug.cgi?id=11516

Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com>
Cc: <stable@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>