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usb: aspeed-vhub: fix ep0 OUT ack received wrong length issue

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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@kernel.crashing.org>
Signed-off-by: Neal Liu <neal_liu@aspeedtech.com>
Link: https://lore.kernel.org/r/20211208100545.1441397-4-neal_liu@aspeedtech.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Neal Liu 2021-12-08 18:05:44 +08:00 committed by Greg Kroah-Hartman
parent 347f3f54bd
commit d693bbd4cb
1 changed files with 7 additions and 0 deletions
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7
drivers/usb/gadget/udc/aspeed-vhub/ep0.c
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@ -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;