usb: dwc3: gadget: when the started list is empty stop the active xfer

When we have nothing left to be queued after handling the last trb
we have to stop the current transfer. This way we can ensure that
the next request will be queued with a new and valid timestamp
and will not directly run into an missed xfer.

Reviewed-by: Thinh Nguyen <thinhn@synopsys.com>
Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Signed-off-by: Felipe Balbi <balbi@kernel.org>

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 779b173..e44bfc3 100644 (file)
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -2738,7 +2738,9 @@ static bool dwc3_gadget_endpoint_trbs_complete(struct dwc3_ep *dep,
        if (dep->flags & DWC3_EP_END_TRANSFER_PENDING)
                goto out;
 
-       if (status == -EXDEV && list_empty(&dep->started_list))
+       if (usb_endpoint_xfer_isoc(dep->endpoint.desc) &&
+               list_empty(&dep->started_list) &&
+               (list_empty(&dep->pending_list) || status == -EXDEV))
                dwc3_stop_active_transfer(dep, true, true);
        else if (dwc3_gadget_ep_should_continue(dep))
                if (__dwc3_gadget_kick_transfer(dep) == 0)