linux-kernel - [PATCH 1/2] serial: bfin-uart: Enable hardware automatic CTS only when CTS pin is available.

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Message-ID: <1323410421-10465-1-git-send-email-sonic.adi@gmail.com>
Date:	Fri, 9 Dec 2011 14:00:20 +0800
From:	Sonic Zhang <sonic.adi@...il.com>
To:	Greg Kroah-Hartman <gregkh@...e.de>, <linux-serial@...r.kernel.org>
CC:	LKML <linux-kernel@...r.kernel.org>,
	<uclinux-dist-devel@...ckfin.uclinux.org>,
	Sonic Zhang <sonic.zhang@...log.com>
Subject: [PATCH 1/2] serial: bfin-uart: Enable hardware automatic CTS only when CTS pin is available.

From: Sonic Zhang <sonic.zhang@...log.com>

Signed-off-by: Sonic Zhang <sonic.zhang@...log.com>
---
 drivers/tty/serial/bfin_uart.c |   19 ++++++++++---------
 1 files changed, 10 insertions(+), 9 deletions(-)

diff --git a/drivers/tty/serial/bfin_uart.c b/drivers/tty/serial/bfin_uart.c
index 21bfa9a..57747c4 100644
--- a/drivers/tty/serial/bfin_uart.c
+++ b/drivers/tty/serial/bfin_uart.c
@@ -726,16 +726,17 @@ static int bfin_serial_startup(struct uart_port *port)
 	}
 #endif
 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
-	if (uart->cts_pin >= 0 && request_irq(uart->status_irq,
-		bfin_serial_mctrl_cts_int,
-		IRQF_DISABLED, "BFIN_UART_MODEM_STATUS", uart)) {
-		uart->cts_pin = -1;
-		pr_info("Unable to attach BlackFin UART Modem Status interrupt.\n");
-	}
+	if (uart->cts_pin >= 0) {
+		if (request_irq(uart->status_irq, bfin_serial_mctrl_cts_int,
+			IRQF_DISABLED, "BFIN_UART_MODEM_STATUS", uart)) {
+			uart->cts_pin = -1;
+			pr_info("Unable to attach BlackFin UART Modem Status interrupt.\n");
+		}
 
-	/* CTS RTS PINs are negative assertive. */
-	UART_PUT_MCR(uart, ACTS);
-	UART_SET_IER(uart, EDSSI);
+		/* CTS RTS PINs are negative assertive. */
+		UART_PUT_MCR(uart, ACTS);
+		UART_SET_IER(uart, EDSSI);
+	}
 #endif
 
 	UART_SET_IER(uart, ERBFI);
-- 
1.7.0.4


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