irqchip: gicv3-its: Fix unsafe locking reported by lockdep
When compiled with CONFIG_LOCKDEP, the kernel shouts badly, saying that my locking is unsafe. I'm afraid the kernel is right: CPU0 CPU1 ---- ---- lock(&its->lock); local_irq_disable(); lock(&irq_desc_lock_class); lock(&its->lock); <Interrupt> lock(&irq_desc_lock_class); *** DEADLOCK *** The fix is to always take its->lock with interrupts disabled. Reported-by:Will Deacon <will.deacon@arm.com> Signed-off-by:
Marc Zyngier <marc.zyngier@arm.com> Link: https://lkml.kernel.org/r/1425659870-11832-5-git-send-email-marc.zyngier@arm.comSigned-off-by:
Jason Cooper <jason@lakedaemon.net>
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