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>

diff --git a/arch/x86/pci/vmd.c b/arch/x86/pci/vmd.c
index b1662bf17937fe9756bd2990ebbae5bacd1721bf..3519a1578752ac7f04bd57435dba0c1ad9cad5bd 100644 (file)
--- 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);
 }