From 97e92306357583c1741f0a111c7befe8673b91ee Mon Sep 17 00:00:00 2001
From: Keith Busch <keith.busch@intel.com>
Date: Tue, 17 May 2016 11:22:18 -0600
Subject: [PATCH] x86/PCI: VMD: Initialize list item in IRQ disable

Multiple calls to disable an IRQ would have caused the driver to
dereference a poisoned list item.  This re-initializes the list to allow
multiple requests to disable the IRQ.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by Jon Derrick: <jonathan.derrick@intel.com>
---
 arch/x86/pci/vmd.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/pci/vmd.c b/arch/x86/pci/vmd.c
index b1662bf17937..3519a1578752 100644
--- a/arch/x86/pci/vmd.c
+++ b/arch/x86/pci/vmd.c
@@ -135,6 +135,7 @@ static void vmd_irq_disable(struct irq_data *data)
 
 	raw_spin_lock(&list_lock);
 	list_del_rcu(&vmdirq->node);
+	INIT_LIST_HEAD_RCU(&vmdirq->node);
 	raw_spin_unlock(&list_lock);
 }