iwlwifi: mei: fix linking when tracing is not enabled

I forgot to add stubs in case tracing is disabled which caused linking errors:

ERROR: modpost: "__SCT__tp_func_iwlmei_sap_data" [drivers/net/wireless/intel/iwlwifi/mei/iwlmei.ko] undefined!
ERROR: modpost: "__SCT__tp_func_iwlmei_me_msg" [drivers/net/wireless/intel/iwlwifi/mei/iwlmei.ko] undefined!
ERROR: modpost: "__tracepoint_iwlmei_sap_cmd" [drivers/net/wireless/intel/iwlwifi/mei/iwlmei.ko] undefined!
ERROR: modpost: "__tracepoint_iwlmei_me_msg" [drivers/net/wireless/intel/iwlwifi/mei/iwlmei.ko] undefined!
ERROR: modpost: "__SCK__tp_func_iwlmei_me_msg" [drivers/net/wireless/intel/iwlwifi/mei/iwlmei.ko] undefined!
ERROR: modpost: "__SCK__tp_func_iwlmei_sap_data" [drivers/net/wireless/intel/iwlwifi/mei/iwlmei.ko] undefined!
ERROR: modpost: "__tracepoint_iwlmei_sap_data" [drivers/net/wireless/intel/iwlwifi/mei/iwlmei.ko] undefined!
ERROR: modpost: "__SCT__tp_func_iwlmei_sap_cmd" [drivers/net/wireless/intel/iwlwifi/mei/iwlmei.ko] undefined!
ERROR: modpost: "__SCK__tp_func_iwlmei_sap_cmd" [drivers/net/wireless/intel/iwlwifi/mei/iwlmei.ko] undefined!

Fixes: 2da4366f ("iwlwifi: mei: add the driver to allow cooperation with CSME")
Reported-by: Jiri Slaby <jirislaby@kernel.org>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Acked-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20211201113411.130409-1-emmanuel.grumbach@intel.com

drivers/net/wireless/intel/iwlwifi/mei/trace-data.h

@@ -3,6 +3,12 @@
  * Copyright(c) 2021        Intel Corporation
  */
 
+#if !defined(CONFIG_IWLWIFI_DEVICE_TRACING)
+
+#define trace_iwlmei_sap_data(...)
+
+#else
+
 #if !defined(__IWLWIFI_DEVICE_TRACE_IWLWIFI_SAP_DATA) || defined(TRACE_HEADER_MULTI_READ)
 
 #ifndef __IWLWIFI_DEVICE_TRACE_IWLWIFI_SAP_DATA
@@ -60,6 +66,11 @@ TRACE_EVENT(iwlmei_sap_data,
 		  __entry->trace_type, __get_dynamic_array_len(data))
 );
 
+/*
+ * If you add something here, add a stub in case
+ * !defined(CONFIG_IWLWIFI_DEVICE_TRACING)
+ */
+
 #endif /* __IWLWIFI_DEVICE_TRACE_IWLWIFI_SAP_DATA */
 
 #undef TRACE_INCLUDE_PATH
@@ -67,3 +78,5 @@ TRACE_EVENT(iwlmei_sap_data,
 #undef TRACE_INCLUDE_FILE
 #define TRACE_INCLUDE_FILE trace-data
 #include <trace/define_trace.h>
+
+#endif /* CONFIG_IWLWIFI_DEVICE_TRACING */

drivers/net/wireless/intel/iwlwifi/mei/trace.h

@@ -3,6 +3,13 @@
  * Copyright(c) 2021        Intel Corporation
  */
 
+#if !defined(CONFIG_IWLWIFI_DEVICE_TRACING)
+
+#define trace_iwlmei_sap_cmd(...)
+#define trace_iwlmei_me_msg(...)
+
+#else
+
 #if !defined(__IWLWIFI_DEVICE_TRACE_IWLWIFI_SAP_CMD) || defined(TRACE_HEADER_MULTI_READ)
 #define __IWLWIFI_DEVICE_TRACE_IWLWIFI_SAP_CMD
 
@@ -53,6 +60,11 @@ TRACE_EVENT(iwlmei_me_msg,
 		  __entry->type, __entry->seq_num)
 );
 
+/*
+ * If you add something here, add a stub in case
+ * !defined(CONFIG_IWLWIFI_DEVICE_TRACING)
+ */
+
 #endif /* __IWLWIFI_DEVICE_TRACE_IWLWIFI_SAP_CMD */
 
 #undef TRACE_INCLUDE_PATH
@@ -60,3 +72,5 @@ TRACE_EVENT(iwlmei_me_msg,
 #undef TRACE_INCLUDE_FILE
 #define TRACE_INCLUDE_FILE trace
 #include <trace/define_trace.h>
+
+#endif /* CONFIG_IWLWIFI_DEVICE_TRACING */