rt2x00: debugfs support - allow a register to be empty

Allow a register to be unspecified, therefore not creating its debugfs
file entry.
Signed-off-by: Anisse Astier <anisse@astier.eu>
Acked-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rt2x00/rt2x00debug.c

@@ -624,22 +624,21 @@ static struct dentry *rt2x00debug_create_file_chipset(const char *name,
 	data += sprintf(data, "revision:\t%04x\n", intf->rt2x00dev->chip.rev);
 	data += sprintf(data, "\n");
 	data += sprintf(data, "register\tbase\twords\twordsize\n");
-	data += sprintf(data, "csr\t%d\t%d\t%d\n",
-			debug->csr.word_base,
-			debug->csr.word_count,
-			debug->csr.word_size);
-	data += sprintf(data, "eeprom\t%d\t%d\t%d\n",
-			debug->eeprom.word_base,
-			debug->eeprom.word_count,
-			debug->eeprom.word_size);
-	data += sprintf(data, "bbp\t%d\t%d\t%d\n",
-			debug->bbp.word_base,
-			debug->bbp.word_count,
-			debug->bbp.word_size);
-	data += sprintf(data, "rf\t%d\t%d\t%d\n",
-			debug->rf.word_base,
-			debug->rf.word_count,
-			debug->rf.word_size);
+#define RT2X00DEBUGFS_SPRINTF_REGISTER(__name)			\
+{								\
+	if(debug->__name.read)					\
+		data += sprintf(data, __stringify(__name)	\
+				"\t%d\t%d\t%d\n",		\
+				debug->__name.word_base,	\
+				debug->__name.word_count,	\
+				debug->__name.word_size);	\
+}
+	RT2X00DEBUGFS_SPRINTF_REGISTER(csr);
+	RT2X00DEBUGFS_SPRINTF_REGISTER(eeprom);
+	RT2X00DEBUGFS_SPRINTF_REGISTER(bbp);
+	RT2X00DEBUGFS_SPRINTF_REGISTER(rf);
+#undef RT2X00DEBUGFS_SPRINTF_REGISTER
+
 	blob->size = strlen(blob->data);
 
 	return debugfs_create_blob(name, S_IRUSR, intf->driver_folder, blob);
@@ -696,6 +695,7 @@ void rt2x00debug_register(struct rt2x00_dev *rt2x00dev)
 
 #define RT2X00DEBUGFS_CREATE_REGISTER_ENTRY(__intf, __name)			\
 ({										\
+	if(debug->__name.read) {						\
 		(__intf)->__name##_off_entry =					\
 		debugfs_create_u32(__stringify(__name) "_offset",		\
 				       S_IRUSR | S_IWUSR,			\
@@ -709,10 +709,11 @@ void rt2x00debug_register(struct rt2x00_dev *rt2x00dev)
 		debugfs_create_file(__stringify(__name) "_value",		\
 					S_IRUSR | S_IWUSR,			\
 					(__intf)->register_folder,		\
-				(__intf), &rt2x00debug_fop_##__name);\
+					(__intf), &rt2x00debug_fop_##__name);	\
 		if (IS_ERR((__intf)->__name##_val_entry)			\
 				|| !(__intf)->__name##_val_entry)		\
 			goto exit;						\
+	}									\
 })
 
 	RT2X00DEBUGFS_CREATE_REGISTER_ENTRY(intf, csr);