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Change how PCI device lookup is done to handle also USB devices, in which case get the USB controller. Instead of taking basename of the 'device' symlink, resolve the full path (example: /sys/devices/pci0000:00/0000:00:09.0/usb4/4-7/4-7:1.0) and take the first part after pci0000:00. Theoretically it could be a bridge, but VM has flat PCI topology. Signed-off-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com> Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>