serial: 8250: Use cached port name directly in messages

Since we have port name stored in struct uart_port, we better to use
that one instead of open coding.

This will make it one place source for easier maintenance or
modifications.

While here, replace printk_ratelimited(KERN_INFO ) by pr_info_ratelimited().
It seems last printk() call in 8250_port.c.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/8250/8250_core.c

@@ -323,7 +323,7 @@ static int univ8250_setup_irq(struct uart_8250_port *up)
 	 * the port is opened so this value needs to be preserved.
 	 */
 	if (up->bugs & UART_BUG_THRE) {
-		pr_debug("ttyS%d - using backup timer\n", serial_index(port));
+		pr_debug("%s - using backup timer\n", port->name);
 
 		up->timer.function = serial8250_backup_timeout;
 		mod_timer(&up->timer, jiffies +

drivers/tty/serial/8250/8250_port.c

@@ -1211,8 +1211,8 @@ static void autoconfig(struct uart_8250_port *up)
 	if (!port->iobase && !port->mapbase && !port->membase)
 		return;
 
-	DEBUG_AUTOCONF("ttyS%d: autoconf (0x%04lx, 0x%p): ",
-		       serial_index(port), port->iobase, port->membase);
+	DEBUG_AUTOCONF("%s: autoconf (0x%04lx, 0x%p): ",
+		       port->name, port->iobase, port->membase);
 
 	/*
 	 * We really do need global IRQs disabled here - we're going to
@@ -1363,9 +1363,8 @@ static void autoconfig(struct uart_8250_port *up)
 		fintek_8250_probe(up);
 
 	if (up->capabilities != old_capabilities) {
-		pr_warn("ttyS%d: detected caps %08x should be %08x\n",
-		       serial_index(port), old_capabilities,
-		       up->capabilities);
+		pr_warn("%s: detected caps %08x should be %08x\n",
+			port->name, old_capabilities, up->capabilities);
 	}
 out:
 	DEBUG_AUTOCONF("iir=%d ", scratch);
@@ -2212,8 +2211,7 @@ int serial8250_do_startup(struct uart_port *port)
 	 */
 	if (!(port->flags & UPF_BUGGY_UART) &&
 	    (serial_port_in(port, UART_LSR) == 0xff)) {
-		printk_ratelimited(KERN_INFO "ttyS%d: LSR safety check engaged!\n",
-				   serial_index(port));
+		pr_info_ratelimited("%s: LSR safety check engaged!\n", port->name);
 		retval = -ENODEV;
 		goto out;
 	}
@@ -2245,8 +2243,8 @@ int serial8250_do_startup(struct uart_port *port)
 	     (port->type == PORT_ALTR_16550_F128)) && (port->fifosize > 1)) {
 		/* Bounds checking of TX threshold (valid 0 to fifosize-2) */
 		if ((up->tx_loadsz < 2) || (up->tx_loadsz > port->fifosize)) {
-			pr_err("ttyS%d TX FIFO Threshold errors, skipping\n",
-			       serial_index(port));
+			pr_err("%s TX FIFO Threshold errors, skipping\n",
+			       port->name);
 		} else {
 			serial_port_out(port, UART_ALTR_AFR,
 					UART_ALTR_EN_TXFIFO_LW);
@@ -2343,8 +2341,8 @@ int serial8250_do_startup(struct uart_port *port)
 	if (lsr & UART_LSR_TEMT && iir & UART_IIR_NO_INT) {
 		if (!(up->bugs & UART_BUG_TXEN)) {
 			up->bugs |= UART_BUG_TXEN;
-			pr_debug("ttyS%d - enabling bad tx status workarounds\n",
-				 serial_index(port));
+			pr_debug("%s - enabling bad tx status workarounds\n",
+				 port->name);
 		}
 	} else {
 		up->bugs &= ~UART_BUG_TXEN;
@@ -2373,8 +2371,8 @@ int serial8250_do_startup(struct uart_port *port)
 	if (up->dma) {
 		retval = serial8250_request_dma(up);
 		if (retval) {
-			pr_warn_ratelimited("ttyS%d - failed to request DMA\n",
-					    serial_index(port));
+			pr_warn_ratelimited("%s - failed to request DMA\n",
+					    port->name);
 			up->dma = NULL;
 		}
 	}