usb: dwc3: ep0: Reset TRB counter for ep0 IN

commit f035d139ffece7b6a7b8bfb17bd0ba715ee57a04 upstream.

DWC3 tracks TRB counter for each ep0 direction separately. In control
read transfer completion handler, the driver needs to reset the TRB
enqueue counter for ep0 IN direction. Currently the driver only resets
the TRB counter for control OUT endpoint. Check for the data direction
and properly reset the TRB counter from correct control endpoint.

Cc: stable@vger.kernel.org
Fixes: c2da2ff00606 ("usb: dwc3: ep0: don't use ep0in for transfers")
Signed-off-by: Thinh Nguyen <thinhn@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/dwc3/ep0.c b/drivers/usb/dwc3/ep0.c
index 75e6cb044eb2b96d173a2c716bb29f5f4fd7f703..89fe53c846ef98424507cc9846bd49cc92a41ad0 100644 (file)
--- a/drivers/usb/dwc3/ep0.c
+++ b/drivers/usb/dwc3/ep0.c
@@ -884,7 +884,12 @@ static void dwc3_ep0_complete_data(struct dwc3 *dwc,
                trb++;
                trb->ctrl &= ~DWC3_TRB_CTRL_HWO;
                trace_dwc3_complete_trb(ep0, trb);
-               ep0->trb_enqueue = 0;
+
+               if (r->direction)
+                       dwc->eps[1]->trb_enqueue = 0;
+               else
+                       dwc->eps[0]->trb_enqueue = 0;
+
                dwc->ep0_bounced = false;
        }