1 files changed, 6 insertions, 3 deletions
diff --git a/os/hal/src/hal_serial.c b/os/hal/src/hal_serial.c
index ee2b9ad55..734316877 100644
--- a/os/hal/src/hal_serial.c
+++ b/os/hal/src/hal_serial.c
@@ -100,13 +100,16 @@ static msg_t _ctl(void *ip, unsigned int operation, void *arg) {
   case CHN_CTL_NOP:
     osalDbgCheck(arg == NULL);
     break;
+  case CHN_CTL_INVALID:
+    osalDbgAssert(false, "invalid CTL operation");
+    break;
   default:
 #if defined(SD_LLD_IMPLEMENTS_CTL)
+    /* Delegating to the LLD if supported.*/
     return sd_lld_control(sdp, operation, arg);
-#endif
-  case CHN_CTL_INVALID:
-    osalDbgAssert(false, "invalid CTL operation");
+#else
     break;
+#endif
   }
   return MSG_OK;
 }