The Linux kernel uio_hv_generic driver does not completely shutdown and clean
up resources properly if application using Netvsc PMD exits.

Implication:
When application using Netvsc PMD is restarted it can not complete
initialization handshake sequence with the host.

Resolution/Workaround:
Either reboot the guest or remove and reinsert the uio_hv_generic module.

Affected Environment/Platform:
Linux Hyper-V.

Driver/Module:
uio_hv_generic module.