From 30d1e0e806e5b2fadc297ba78f2d7afd6ba309cf Mon Sep 17 00:00:00 2001
From: Chen Gang <gang.chen.5i5j@gmail.com>
Date: Fri, 8 Aug 2014 23:37:59 +0800
Subject: [PATCH] virt/kvm/assigned-dev.c: Set 'dev->irq_source_id' to '-1'
 after free it

As a generic function, deassign_guest_irq() assumes it can be called
even if assign_guest_irq() is not be called successfully (which can be
triggered by ioctl from user mode, indirectly).

So for assign_guest_irq() failure process, need set 'dev->irq_source_id'
to -1 after free 'dev->irq_source_id', or deassign_guest_irq() may free
it again.

Signed-off-by: Chen Gang <gang.chen.5i5j@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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