On Sat, 15 Feb 2014, Steven Xiao wrote: > Hi Alan, > > Can you please elaborate why this change about handling NRDY was > introduced into Linux 3.11? As far as I know, there have been no changes introduced into 3.11 that affect the way NRDY is handled. But I'm not an expert on the xhci-hcd driver. You should ask the driver's maintainer. > Or is there a bug number tracking this > change? Not that I know of. > In my understanding, NRDYs are sent by the device to indicate > that the endpoint is not ready to send or receive packets. When the > host receives an NRDY, the attempt of reaping URB should be blocked, > because no URBs are completed at that point, until it receives ERDY. That's right. Are you sure your device didn't send an ERDY after it sent NRDY? 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
