# rmmod usb_storage
rmmod: ERROR: Module usb_storage is in use by: uas
# lsmod | grep uas
uas 12493 0
usb_storage 47494 1 uas
usbcore 186274 7 usbhid,usb_storage,ehci_hcd,uhci_hcd,usblp,uas,ehci_pci
scsi_mod 201211 5 sd_mod,usb_storage,libata,uas,sr_mod
# rmmod uas
# rmmod usb_storage
#