HelenOS sources

req_set_port_feature  615 uspace/drv/bus/usb/ehci/ehci_rh.c 		.callback = req_set_port_feature,
req_set_port_feature  534 uspace/drv/bus/usb/ohci/ohci_rh.c 		.callback = req_set_port_feature,
req_set_port_feature  504 uspace/drv/bus/usb/uhci/uhci_rh.c 		.callback = req_set_port_feature
req_set_port_feature  401 uspace/drv/bus/usb/vhc/hub/virthubops.c 		.callback = req_set_port_feature