From: James Hogan <james.hogan@imgtec.com>
Date: Mon, 1 Jul 2013 14:36:38 +0000 (+0100)
Subject: metag: cpu hotplug: route_irq: preserve irq mask
X-Git-Tag: v3.11-rc1~79^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8b8b2412994fffd5a8ab3b9209fa0aa9f0fcee4c;p=pandora-kernel.git

metag: cpu hotplug: route_irq: preserve irq mask

The route_irq() function needs to preserve the irq mask by using the
_irqsave/irqrestore variants of raw spin lock functions instead of the
_irq variants. This is because it is called from __cpu_disable() (via
migrate_irqs()), which is called with IRQs disabled, so using the _irq
variants re-enables IRQs.

This appears to have been causing occasional hits of the
BUG_ON(!irqs_disabled()) in __irq_work_run() during CPU hotplug soak
testing:
  BUG: failure at kernel/irq_work.c:122/__irq_work_run()!

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
---

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