From d693bbd4cbc44dac34dbf6c49c844d30f18ad0c1 Mon Sep 17 00:00:00 2001 From: Neal Liu Date: Wed, 8 Dec 2021 18:05:44 +0800 Subject: [PATCH] usb: aspeed-vhub: fix ep0 OUT ack received wrong length issue If multiple devices in vhub are enumerated simultaneously, ep0 OUT ack might received wrong data length. Using expected data length instead. Acked-by: Benjamin Herrenschmidt Signed-off-by: Neal Liu Link: https://lore.kernel.org/r/20211208100545.1441397-4-neal_liu@aspeedtech.com Signed-off-by: Greg Kroah-Hartman --- drivers/usb/gadget/udc/aspeed-vhub/ep0.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/usb/gadget/udc/aspeed-vhub/ep0.c b/drivers/usb/gadget/udc/aspeed-vhub/ep0.c index 74ea36c..b4cf462 100644 --- a/drivers/usb/gadget/udc/aspeed-vhub/ep0.c +++ b/drivers/usb/gadget/udc/aspeed-vhub/ep0.c @@ -251,6 +251,13 @@ static void ast_vhub_ep0_do_receive(struct ast_vhub_ep *ep, struct ast_vhub_req len = remain; rc = -EOVERFLOW; } + + /* Hardware return wrong data len */ + if (len < ep->ep.maxpacket && len != remain) { + EPDBG(ep, "using expected data len instead\n"); + len = remain; + } + if (len && req->req.buf) memcpy(req->req.buf + req->req.actual, ep->buf, len); req->req.actual += len; -- 2.7.4