On Tue, 11 Mar 2014, David Mosberger wrote: > So I hooked up a Seleae Logic and I still can't find anything obvious > that's wrong. I attached the decoded USB trace for the last WRITE10 > request that's ends up with "infinite" NAKs. > > After receiving 8 contiguous NAKs, my driver prints some kernel > messages and a command log trace, so that's why after the 8th NAK you > see nothing more going on. In reality, the OUT commands keep getting > NAKd after the kernel messages are printed. > > From what I can see, usb-storage sends a valid WRITE10 command > indicating that it will write 61440 bytes. Actually it says that it will write 122880 bytes. > After ~147x 64-byte writes > (~9408 bytes) the NAKs start. Previous WRITE10s with same length work > fine. > > Anybody sees anything wrong in this trace? It looks like the host controller is behaving correctly, which means the fault is in the device. Have you tried plugging this device into a regular Linux PC and running the same test? 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
