linux-kernel - RE: [PATCH] x86/ioapic: Fix NULL pointer dereference on CPU hotplug after disabling irqs

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Date:	Wed, 25 Jul 2012 23:28:38 +0000
From:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>
To:	Tomoki Sekiyama <tomoki.sekiyama.qu@...achi.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"mingo@...nel.org" <mingo@...nel.org>
CC:	"hpa@...or.com" <hpa@...or.com>,
	"yinghai@...nel.org" <yinghai@...nel.org>,
	"agordeev@...hat.com" <agordeev@...hat.com>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"yrl.pp-manager.tt@...achi.com" <yrl.pp-manager.tt@...achi.com>
Subject: RE: [PATCH] x86/ioapic: Fix NULL pointer dereference on CPU hotplug
 after disabling irqs

Tomoki wrote:
> In current Linux, percpu variable `vector_irq' is not always cleared when
> a CPU is offlined. If the cpu that has the disabled irqs in vector_irq is
> hotplugged again, __setup_vector_irq() hits invalid irq vector and may
> crash.
>
> Commit f6175f5bfb4c partially fixes this, but was not enough in
> environments with IOMMU IRQ remapper.

So, this patch essentially makes the commit f6175f5bfb4c unnecessary, right?

Can you revert that too as part of this new proposed patch?

thanks,
suresh--
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