virtio_pci: Clear stale cpumask when setting irq affinity

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.

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

diff --git a/drivers/virtio/virtio_pci_common.c b/drivers/virtio/virtio_pci_common.c
index e894eb278d8336d018d3e6e8c29556dc9b5f3cb5..eba1b7ac729454d30b1d611cd01d45b5ba23407e 100644 (file)
--- 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 *vq, int cpu)
                if (cpu == -1)
                        irq_set_affinity_hint(irq, NULL);
                else {
+                       cpumask_clear(mask);
                        cpumask_set_cpu(cpu, mask);
                        irq_set_affinity_hint(irq, mask);
                }