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 <benh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Neal Liu <neal_liu@xxxxxxxxxxxxxx>
---
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 74ea36c19b1e..b4cf46249fea 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;
--
2.25.1
