Revert "hci ldisc: Add single thread workqueue instead of system_wq"

This reverts commit 6137b92.

Change-Id: I9c8b52d71a857b2753042c39535a56522c1ff0d3

Author: Kirt Hsieh

drivers/bluetooth/hci_ldisc.c

@@ -134,7 +134,7 @@ int hci_uart_tx_wakeup(struct hci_uart *hu)
 
 	BT_DBG("");
 
-	queue_work(hu->hci_uart_wq, &hu->write_work);
+	schedule_work(&hu->write_work);
 
 	return 0;
 }
@@ -474,15 +474,6 @@ static int hci_uart_tty_open(struct tty_struct *tty)
 		return -ENFILE;
 	}
 
-	BT_INFO("Create singlethread HCI UART tx wq");
-	hu->hci_uart_wq = create_singlethread_workqueue("hci_uart_tx_wq");
-	if (!hu->hci_uart_wq) {
-		BT_ERR("Can't create single wq for hci uart tx");
-		kfree(hu);
-		hu = NULL;
-		return -EINVAL;
-	}
-
 	tty->disc_data = hu;
 	hu->tty = tty;
 	tty->receive_room = 65536;
@@ -536,9 +527,6 @@ static void hci_uart_tty_close(struct tty_struct *tty)
 	}
 	clear_bit(HCI_UART_PROTO_SET, &hu->flags);
 
-	flush_workqueue(hu->hci_uart_wq);
-	destroy_workqueue(hu->hci_uart_wq);
-
 	kfree(hu);
 }
 

drivers/bluetooth/hci_uart.h

@@ -91,8 +91,6 @@ struct hci_uart {
 
 	unsigned int init_speed;
 	unsigned int oper_speed;
-
-	struct workqueue_struct *hci_uart_wq;
 };
 
 /* HCI_UART proto flag bits */