On Mon, 29 Jun 2015, Peter Chen wrote: > Just like Steve pointed, it should be a ZLT problem, do you have > below patch in your tree, and the host may not send zlt, but you > may queue an zero-length request, the f_hid does not set req->zero > flag either. > > commit 953c66469735aed8d2ada639a72b150f01dae605 > Author: Abbas Raza <Abbas_Raza@xxxxxxxxxx> > Date: Thu Jul 17 19:34:31 2014 +0800 > > usb: chipidea: udc: Disable auto ZLP generation on ep0 > > > If it still has problem, send me apps if possible (with needed kernel > patches). Note that a UDC should _never_ queue an extra zero-length packet for an OUT transfer, no matter how req->zero is set. In other words, req->zero is supposed to affect only IN transfers. 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
