diff options
| author | Neal Liu <neal_liu@aspeedtech.com> | 2021-12-08 18:05:44 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-12-13 15:01:46 +0100 |
| commit | d693bbd4cbc44dac34dbf6c49c844d30f18ad0c1 (patch) | |
| tree | 1f0afbb34bde1987f0f8bea6c89d100e965f3b2c /drivers/usb/gadget | |
| parent | 347f3f54bd457ff76230e1d516cdd5f8235e2f5b (diff) | |
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 <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>
Diffstat (limited to 'drivers/usb/gadget')
| -rw-r--r-- | drivers/usb/gadget/udc/aspeed-vhub/ep0.c | 7 |
1 files changed, 7 insertions, 0 deletions
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; |