usb: dwc3: ep0: Clear started flag on completion

commit 2d7b78f59e020b07fc6338eefe286f54ee2d6773 upstream.

Clear ep0's DWC3_EP_TRANSFER_STARTED flag if the END_TRANSFER command is
completed. Otherwise, we can't start control transfer again after
END_TRANSFER.

Cc: stable@vger.kernel.org
Signed-off-by: Thinh Nguyen <thinhn@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/dwc3/ep0.c b/drivers/usb/dwc3/ep0.c
index 8efde178eef4d55faeb91aa924bcc82e7b548a41..2fb02f87740112d3f88dd6144078dd12f0719edf 100644 (file)
--- a/drivers/usb/dwc3/ep0.c
+++ b/drivers/usb/dwc3/ep0.c
@@ -1110,6 +1110,9 @@ static void dwc3_ep0_xfernotready(struct dwc3 *dwc,
 void dwc3_ep0_interrupt(struct dwc3 *dwc,
                const struct dwc3_event_depevt *event)
 {
+       struct dwc3_ep  *dep = dwc->eps[event->endpoint_number];
+       u8              cmd;
+
        switch (event->endpoint_event) {
        case DWC3_DEPEVT_XFERCOMPLETE:
                dwc3_ep0_xfer_complete(dwc, event);
@@ -1122,7 +1125,12 @@ void dwc3_ep0_interrupt(struct dwc3 *dwc,
        case DWC3_DEPEVT_XFERINPROGRESS:
        case DWC3_DEPEVT_RXTXFIFOEVT:
        case DWC3_DEPEVT_STREAMEVT:
+               break;
        case DWC3_DEPEVT_EPCMDCMPLT:
+               cmd = DEPEVT_PARAMETER_CMD(event->parameters);
+
+               if (cmd == DWC3_DEPCMD_ENDTRANSFER)
+                       dep->flags &= ~DWC3_EP_TRANSFER_STARTED;
                break;
        }
 }