On Sun, 31 Aug 2014, vichy wrote: > >> My questions: > >> 1. is there anything I need to do, such as PCI driver, before bind to > >> usb-storage driver? > > > > Normally, if uas will bind to a device then usb-storage won't. You can > > change this by using a module paramter for usb-storage: > > > > modprobe usb-storage quirks=1759:5002:u > > > > (1759 and 5002 are the vendor and product IDs for this device.) > Is there any interface priority written in driver to let uas instead > of usb-storage bind the device? Yes. If a device supports both transports then the kernel will use uas instead of usb-storage, because it is more efficient. The quirk overrides this behavior. > BTW, if we try not let uas bind the device, why don't we add the quirk > in uas but usb-storage? What is the "u" at the end of command mean? In fact, uas uses usb-storage for quirk handling. So if you add the quirk to usb-storage then it will apply to both drivers. The 'u' means: Don't use the uas driver. This is supposed to be explained in Documentation/kernel-parameters.txt, but it got left out. I will have to add it. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
