4.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jiang Liu <[email protected]>

commit 210d150e1f5da506875e376422ba31ead2d49621 upstream.

The cpumask vp_dev->msix_affinity_masks[info->msix_vector] may contain
staled information when vp_set_vq_affinity() gets called, so clear it
before setting the new cpu bit mask.

Signed-off-by: Jiang Liu <[email protected]>
Signed-off-by: Michael S. Tsirkin <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

---
 drivers/virtio/virtio_pci_common.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/virtio/virtio_pci_common.c
+++ b/drivers/virtio/virtio_pci_common.c
@@ -423,6 +423,7 @@ int vp_set_vq_affinity(struct virtqueue
                if (cpu == -1)
                        irq_set_affinity_hint(irq, NULL);
                else {
+                       cpumask_clear(mask);
                        cpumask_set_cpu(cpu, mask);
                        irq_set_affinity_hint(irq, mask);
                }


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