Apparently this gadget doesn't support setting usb_cdc_line_coding.
But the code pretends that it supports, and queues a zero length
request for the DATA phase. That will cause overflow for udc in
processing the DATA transaction. The patch make it return -EOPNOTSUPP
and stall cleanly.
Signed-off-by: Li Yang <[EMAIL PROTECTED]>
---
diff --git a/drivers/usb/gadget/serial.c b/drivers/usb/gadget/serial.c
index e552668..0911bc4 100644
--- a/drivers/usb/gadget/serial.c
+++ b/drivers/usb/gadget/serial.c
@@ -1692,14 +1692,7 @@ static int gs_setup_class(struct usb_gadget *gadget,
switch (ctrl->bRequest) {
case USB_CDC_REQ_SET_LINE_CODING:
- ret = min(wLength,
- (u16)sizeof(struct usb_cdc_line_coding));
- if (port) {
- spin_lock(&port->port_lock);
- memcpy(&port->port_line_coding, req->buf, ret);
- spin_unlock(&port->port_lock);
- }
- ret = 0;
+ /* FIXME: We don't support set line coding */
break;
case USB_CDC_REQ_GET_LINE_CODING:
-------------------------------------------------------------------------
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