From: Mark McLoughlin <markmc@redhat.com>
Date: Mon, 1 Dec 2008 13:57:46 +0000 (+0000)
Subject: KVM: make kvm_unregister_irq_ack_notifier() safe
X-Git-Tag: v2.6.29-rc1~539^2~37
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fdd897e6b5253a45b633f7d334cf3e150bbaf386;p=pandora-kernel.git

KVM: make kvm_unregister_irq_ack_notifier() safe

We never pass a NULL notifier pointer here, but we may well
pass a notifier struct which hasn't previously been
registered.

Guard against this by using hlist_del_init() which will
not do anything if the node hasn't been added to the list
and, when removing the node, will ensure that a subsequent
call to hlist_del_init() will be fine too.

Fixes an oops seen when an assigned device is freed before
and IRQ is assigned to it.

Signed-off-by: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
---

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