> > Because the fsl_udc_core driver shares one 'status_req' object for the > complete ep0 control transfer, it is not possible to prime the final > STATUS phase immediately after the IN transaction. E.g. ch9getstatus() > executed: > > | req = udc->status_req; > | ... > | list_add_tail(&req->queue, &ep->queue); > | if (ep0_prime_status(udc, EP_DIR_OUT)) > | .... > | struct fsl_req *req = udc->status_req; > | list_add_tail(&req->queue, &ep->queue); > > which corrupts the ep->queue list by inserting 'status_req' twice. This > causes a kernel oops e.g. when 'lsusb -v' is executed on the host. > > Patch delays the final 'ep0_prime_status(udc, EP_DIR_OUT))' by moving it > into the ep0 completion handler. > Enrico, thanks for pointing this problem. As "prime STATUS phase immediately after the IN transaction" is followed USB 2.0 spec, to fix this problem, it is better to add data_req for ep0. In fact, it is already at FSL i.mx internal code, just still not mainlined. Peter -- 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
