From: Marc Zyngier <marc.zyngier@arm.com>
Date: Fri, 6 Mar 2015 16:37:44 +0000 (+0000)
Subject: irqchip: gic: Fix unsafe locking reported by lockdep
X-Git-Tag: omap-for-v4.1/wl12xx-dt~10^2^2~6
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cf613871946230c5dd8178d07bcdc2984f4545cd;p=pandora-kernel.git

irqchip: gic: Fix unsafe locking reported by lockdep

When compiled with CONFIG_LOCKDEP, the kernel shouts badly, saying
that the locking in the GIC code is unsafe. I'm afraid the kernel
is right:

       CPU0
       ----
  lock(irq_controller_lock);
  <Interrupt>
    lock(irq_controller_lock);

 *** DEADLOCK ***

This can happen while enabling, disabling, setting the type
or the affinity of an interrupt.

The fix is to take the interrupt_controller_lock with interrupts
disabled in these cases.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Link: https://lkml.kernel.org/r/1425659870-11832-6-git-send-email-marc.zyngier@arm.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
---

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