linux-kernel - Re: Possible race window when walking irq descriptors

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Date:	Fri, 5 Jun 2015 12:06:19 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Jiang Liu <jiang.liu@...ux.intel.com>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Possible race window when walking irq descriptors

On Fri, 5 Jun 2015, Jiang Liu wrote:
> 4) Called during cpu_up()
> kernel/irq/chip.c:irq_cpu_online()
> arch/x86/kernel/apic/vector.c:__setup_vector_irq()
> 
> 5) Called from free running process context
> arch/x86/kernel/topology.c: arch_register_cpu()
> arch/x86/kernel/apic/io_apic.c: print_IO_APICs()
> kernel/irq/autoprobe.c: probe_irq_on()/probe_irq_mask()/probe_irq_off()
> 
> 6) Called from free running interrupt context
> kernel/irq/spurious.c: poll_spurious_irqs()/misrouted_irq()
> 
> So seems something needs to done to protect 4), 5) and 6). Is this
> analysis correct? If so, I will try to work out some patches for it.

Yes, you are right. We noticed that years ago and completely forgot
about it.

Thanks,

	tglx
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