serial: 8250_exar: Consolidate callback assignments in default_setup()

For better maintenance consolidate port callbacks in default_setup().
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20190805142535.21948-1-andriy.shevchenko@linux.intel.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/8250/8250_exar.c

@@ -166,6 +166,26 @@ static void xr17v35x_set_divisor(struct uart_port *p, unsigned int baud,
 	serial_port_out(p, 0x2, quot_frac);
 }
 
+static void exar_shutdown(struct uart_port *port)
+{
+	unsigned char lsr;
+	bool tx_complete = 0;
+	struct uart_8250_port *up = up_to_u8250p(port);
+	struct circ_buf *xmit = &port->state->xmit;
+	int i = 0;
+
+	do {
+		lsr = serial_in(up, UART_LSR);
+		if (lsr & (UART_LSR_TEMT | UART_LSR_THRE))
+			tx_complete = 1;
+		else
+			tx_complete = 0;
+		msleep(1);
+	} while (!uart_circ_empty(xmit) && !tx_complete && i++ < 1000);
+
+	serial8250_do_shutdown(port);
+}
+
 static int default_setup(struct exar8250 *priv, struct pci_dev *pcidev,
 			 int idx, unsigned int offset,
 			 struct uart_8250_port *port)
@@ -197,6 +217,7 @@ static int default_setup(struct exar8250 *priv, struct pci_dev *pcidev,
 	}
 
 	port->port.pm = exar_pm;
+	port->port.shutdown = exar_shutdown;
 
 	return 0;
 }
@@ -519,27 +540,6 @@ static irqreturn_t exar_misc_handler(int irq, void *data)
 	return IRQ_HANDLED;
 }
 
-static void
-exar_shutdown(struct uart_port *port)
-{
-	unsigned char lsr;
-	bool tx_complete = 0;
-	struct uart_8250_port *up = up_to_u8250p(port);
-	struct circ_buf *xmit = &port->state->xmit;
-	int i = 0;
-
-	do {
-		lsr = serial_in(up, UART_LSR);
-		if (lsr & (UART_LSR_TEMT | UART_LSR_THRE))
-			tx_complete = 1;
-		else
-			tx_complete = 0;
-		msleep(1);
-	} while (!uart_circ_empty(xmit) && !tx_complete && i++ < 1000);
-
-	serial8250_do_shutdown(port);
-}
-
 static int
 exar_pci_probe(struct pci_dev *pcidev, const struct pci_device_id *ent)
 {
@@ -580,7 +580,6 @@ exar_pci_probe(struct pci_dev *pcidev, const struct pci_device_id *ent)
 	uart.port.flags = UPF_SHARE_IRQ | UPF_EXAR_EFR | UPF_FIXED_TYPE | UPF_FIXED_PORT;
 	uart.port.irq = pci_irq_vector(pcidev, 0);
 	uart.port.dev = &pcidev->dev;
-	uart.port.shutdown = exar_shutdown;
 
 	rc = devm_request_irq(&pcidev->dev, uart.port.irq, exar_misc_handler,
 			 IRQF_SHARED, "exar_uart", priv);