staging: wilc1000: replace sem_test_disconn_block with a completion

Semaphore sem_test_disconn_block is used to signal completion of its
host interface message. Since the thread locking this semaphore will
have to wait, completions are the preferred mechanism and will offer
a performance improvement.
Signed-off-by: Alison Schofield <amsfield22@gmail.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Tested-by: Leo Kim <leo.kim@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wilc1000/host_interface.c

@@ -1857,7 +1857,7 @@ static void Handle_Disconnect(struct wilc_vif *vif)
 		}
 	}
 
-	up(&hif_drv->sem_test_disconn_block);
+	complete(&hif_drv->comp_test_disconn_block);
 }
 
 void wilc_resolve_disconnect_aberration(struct wilc_vif *vif)
@@ -3099,7 +3099,7 @@ int wilc_disconnect(struct wilc_vif *vif, u16 reason_code)
 	if (result)
 		netdev_err(vif->ndev, "Failed to send message: disconnect\n");
 
-	down(&hif_drv->sem_test_disconn_block);
+	wait_for_completion(&hif_drv->comp_test_disconn_block);
 
 	return result;
 }
@@ -3406,7 +3406,7 @@ int wilc_init(struct net_device *dev, struct host_if_drv **hif_drv_handler)
 	}
 
 	sema_init(&hif_drv->sem_test_key_block, 0);
-	sema_init(&hif_drv->sem_test_disconn_block, 0);
+	init_completion(&hif_drv->comp_test_disconn_block);
 	init_completion(&hif_drv->comp_get_rssi);
 	init_completion(&hif_drv->comp_inactive_time);
 

drivers/staging/wilc1000/host_interface.h

@@ -276,7 +276,7 @@ struct host_if_drv {
 
 	struct mutex cfg_values_lock;
 	struct semaphore sem_test_key_block;
-	struct semaphore sem_test_disconn_block;
+	struct completion comp_test_disconn_block;
 	struct completion comp_get_rssi;
 	struct completion comp_inactive_time;