diff --git a/drivers/staging/rtl8192u/r8192U_dm.h b/drivers/staging/rtl8192u/r8192U_dm.h
index ae550520311b..3008f91ad4cf 100644
--- a/drivers/staging/rtl8192u/r8192U_dm.h
+++ b/drivers/staging/rtl8192u/r8192U_dm.h
@@ -200,9 +200,9 @@ typedef struct tag_Tx_Config_Cmd_Format {
 
 
 /*------------------------Export global variable----------------------------*/
-extern	dig_t	dm_digtable;
-extern	u8		dm_shadow[16][256];
-extern DRxPathSel      DM_RxPathSelTable;
+extern dig_t dm_digtable;
+extern u8 dm_shadow[16][256];
+extern DRxPathSel DM_RxPathSelTable;
 /*------------------------Export global variable----------------------------*/
 
 
@@ -212,25 +212,23 @@ extern DRxPathSel      DM_RxPathSelTable;
 
 
 /*--------------------------Exported Function prototype---------------------*/
-extern  void    init_hal_dm(struct net_device *dev);
-extern  void deinit_hal_dm(struct net_device *dev);
-
+extern void init_hal_dm(struct net_device *dev);
+extern void deinit_hal_dm(struct net_device *dev);
 extern void hal_dm_watchdog(struct net_device *dev);
-
-extern  void    init_rate_adaptive(struct net_device *dev);
-extern  void    dm_txpower_trackingcallback(struct work_struct *work);
-extern  void    dm_restore_dynamic_mechanism_state(struct net_device *dev);
-extern  void    dm_backup_dynamic_mechanism_state(struct net_device *dev);
-extern  void    dm_change_dynamic_initgain_thresh(struct net_device *dev,
-						u32 dm_type, u32 dm_value);
-extern  void    dm_force_tx_fw_info(struct net_device *dev,
-					u32 force_type, u32 force_value);
-extern  void    dm_init_edca_turbo(struct net_device *dev);
-extern  void    dm_rf_operation_test_callback(unsigned long data);
-extern  void    dm_rf_pathcheck_workitemcallback(struct work_struct *work);
-extern  void dm_fsync_timer_callback(unsigned long data);
-extern	void	dm_cck_txpower_adjust(struct net_device *dev, bool  binch14);
-extern  void    dm_shadow_init(struct net_device *dev);
+extern void init_rate_adaptive(struct net_device *dev);
+extern void dm_txpower_trackingcallback(struct work_struct *work);
+extern void dm_restore_dynamic_mechanism_state(struct net_device *dev);
+extern void dm_backup_dynamic_mechanism_state(struct net_device *dev);
+extern void dm_change_dynamic_initgain_thresh(struct net_device *dev,
+					      u32 dm_type, u32 dm_value);
+extern void dm_force_tx_fw_info(struct net_device *dev,
+				u32 force_type, u32 force_value);
+extern void dm_init_edca_turbo(struct net_device *dev);
+extern void dm_rf_operation_test_callback(unsigned long data);
+extern void dm_rf_pathcheck_workitemcallback(struct work_struct *work);
+extern void dm_fsync_timer_callback(unsigned long data);
+extern void dm_cck_txpower_adjust(struct net_device *dev, bool  binch14);
+extern void dm_shadow_init(struct net_device *dev);
 extern void dm_initialize_txpower_tracking(struct net_device *dev);
 /*--------------------------Exported Function prototype---------------------*/