[PATCH v2] usb: dwc3: Add error logs for unknown endpoint events

[Roy Luo <royluo@google.com>]

In cases where the controller somehow fails to write to event buffer
memory (e.g. due to incorrect MMU config), the driver would receive
all-zero dwc3 events. However, the abnormal event is silently dropped
as a regular ep0out event.
Add error logs when an unknown endpoint event is received to highlight
the anomaly.

Signed-off-by: Roy Luo <royluo@google.com>
---
 drivers/usb/dwc3/ep0.c    | 3 +++
 drivers/usb/dwc3/gadget.c | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/drivers/usb/dwc3/ep0.c b/drivers/usb/dwc3/ep0.c
index 953b752a5052..b94243237293 100644
--- a/drivers/usb/dwc3/ep0.c
+++ b/drivers/usb/dwc3/ep0.c
@@ -1207,5 +1207,8 @@ void dwc3_ep0_interrupt(struct dwc3 *dwc,
 			dep->flags &= ~DWC3_EP_TRANSFER_STARTED;
 		}
 		break;
+	default:
+		dev_err(dwc->dev, "unknown endpoint event %d\n", event->endpoint_event);
+		break;
 	}
 }
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index c0ca4d12f95d..7163d5d0eea0 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -3803,6 +3803,9 @@ static void dwc3_endpoint_interrupt(struct dwc3 *dwc,
 		break;
 	case DWC3_DEPEVT_RXTXFIFOEVT:
 		break;
+	default:
+		dev_err(dwc->dev, "unknown endpoint event %d\n", event->endpoint_event);
+		break;
 	}
 }
 

base-commit: c8c655c34e33544aec9d64b660872ab33c29b5f1
-- 
2.40.1.495.gc816e09b53d-goog