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>

1 files changed, 1 insertions, 0 deletions

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);
 }