virtio_pci: Clear stale cpumask when setting irq affinity
authorJiang Liu <jiang.liu@linux.intel.com>
Thu, 4 Jun 2015 08:41:44 +0000 (16:41 +0800)
committerMichael S. Tsirkin <mst@redhat.com>
Thu, 4 Jun 2015 12:47:49 +0000 (14:47 +0200)
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: stable@vger.kernel.org
Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
drivers/virtio/virtio_pci_common.c

index e894eb2..eba1b7a 100644 (file)
@@ -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);
                }