irqchip: gic: Fix unsafe locking reported by lockdep

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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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Marc Zyngier 2015-03-06 16:37:44 +00:00 • committed by Jason Cooper

parent 3e39e8f56c

commit cf61387194

1 changed files with 12 additions and 8 deletions

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drivers/irqchip/irq-gic.c

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