Hi, >> >> In the log file, is there any invalid request received on endpoint 0? >> > >> > In the usbmon file there is. It is this line: >> > >> >> f4ae6f40 1217192721 S Co:2:018:0 s 21 ff 0000 0000 0000 0 >> >> ok, i will add code to UDC to instruct hardware to send NAK upon >> receiving invalid request on endpoint 0. Does it mean that UDC driver >> has to check for invalid request on endpoint 0? > > No. The UDC driver has no way to know whether a request is valid or > not. Read the description of the "setup" member of the > usb_gadget_driver structure in the header file. > I read that. The "setup" member of the usb_gadget_driver structure is pointing to fsg_setup, in file_storage.c. The fsg_setup() function handles the request on endpoint 0. So how could UDC driver know when to send NAK? Thanks, victor -- 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
