virtio-pci: Fix legacy device flag setting error in probe

The 'is_legacy' flag is used to differentiate between legacy vs modern
device. Currently, it is based on the value of vp_dev->ldev.ioaddr.
However, due to the shared memory of the union between struct
virtio_pci_legacy_device and struct virtio_pci_modern_device, when
virtio_pci_modern_probe modifies the content of struct
virtio_pci_modern_device, it affects the content of struct
virtio_pci_legacy_device, and ldev.ioaddr is no longer zero, causing
the 'is_legacy' flag to be set as true. To resolve issue, when legacy
device is probed, mark 'is_legacy' as true, when modern device is
probed, keep 'is_legacy' as false.

Fixes: 4f0fc22534e3 ("virtio_pci: Optimize virtio_pci_device structure size")
Signed-off-by: Feng Liu <[e-mail]>
Reviewed-by: Parav Pandit <[e-mail]>
Reviewed-by: Jiri Pirko <[e-mail]>
Message-Id: <[e-mail]>
Signed-off-by: Michael S. Tsirkin <[e-mail]>
Reviewed-by: Xuan Zhuo <[e-mail]>
Acked-by: Jason Wang <[e-mail]>

drivers/virtio/virtio_pci_common.c

···
 
 	pci_set_master(pci_dev);
 
-	vp_dev->is_legacy = vp_dev->ldev.ioaddr ? true : false;
-
 	rc = register_virtio_device(&vp_dev->vdev);
 	reg_dev = vp_dev;
 	if (rc)

drivers/virtio/virtio_pci_legacy.c

···
 	vp_dev->config_vector = vp_config_vector;
 	vp_dev->setup_vq = setup_vq;
 	vp_dev->del_vq = del_vq;
+	vp_dev->is_legacy = true;
 
 	return 0;
 }