usb: dwc3: ep0: prevent starting transfers twice on ep0

In case we try to start an invalid test mode, we
will call dwc3_ep0_stall_and_restart() but we will
also call dwc3_ep0_out_start() which will start
a second transfer on ep0.

Let's prevent any problems by returning early in
the error case.

Signed-off-by: Felipe Balbi <balbi@ti.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/usb/dwc3/ep0.c b/drivers/usb/dwc3/ep0.c
index 9a8f26cef0a1..8244eb53082e 100644
--- a/drivers/usb/dwc3/ep0.c
+++ b/drivers/usb/dwc3/ep0.c
@@ -744,6 +744,7 @@ static void dwc3_ep0_complete_status(struct dwc3 *dwc,
                         dev_dbg(dwc->dev, "Invalid Test #%d\n",
                                         dwc->test_mode_nr);
                         dwc3_ep0_stall_and_restart(dwc);
+                        return;
                 }
         }