linux-kernel - [PATCH v2] tty: serial: msm_serial.c: Cleaning up uninitialized variables

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Date:	Sun,  6 Jul 2014 18:47:12 +0200
From:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
To:	David Brown <davidb@...eaurora.org>,
	Daniel Walker <dwalker@...o99.com>
Cc:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>,
	Bryan Huntsman <bryanh@...eaurora.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	linux-arm-msm@...r.kernel.org, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: [PATCH v2] tty: serial: msm_serial.c:  Cleaning up uninitialized variables

Set reasonable initial value of some variables, in case
they do not get set to something otherwise.
And I've also added a plausibility control of the values.

Signed-off-by: Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
---
 drivers/tty/serial/msm_serial.c |   18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/drivers/tty/serial/msm_serial.c b/drivers/tty/serial/msm_serial.c
index 72000a6..4491108 100644
--- a/drivers/tty/serial/msm_serial.c
+++ b/drivers/tty/serial/msm_serial.c
@@ -917,7 +917,7 @@ static int __init msm_console_setup(struct console *co, char *options)
 {
 	struct uart_port *port;
 	struct msm_port *msm_port;
-	int baud, flow, bits, parity;
+	int baud = 115200, flow = 'n', bits = 8, parity = 'n';
 
 	if (unlikely(co->index >= UART_NR || co->index < 0))
 		return -ENXIO;
@@ -930,17 +930,21 @@ static int __init msm_console_setup(struct console *co, char *options)
 
 	msm_init_clock(port);
 
-	if (options)
+	if (options) {
 		uart_parse_options(options, &baud, &parity, &bits, &flow);
+		if (baud < 300 || baud > 115200)
+			baud = 115200;
+		if (NULL == strchr("noeNOE", parity))
+			parity = 'n';
+		if (bits != 7)
+			bits = 8;
+		if (flow != 'r')
+			flow = 'n';
+	}
 
-	bits = 8;
-	parity = 'n';
-	flow = 'n';
 	msm_write(port, UART_MR2_BITS_PER_CHAR_8 | UART_MR2_STOP_BIT_LEN_ONE,
 		  UART_MR2);	/* 8N1 */
 
-	if (baud < 300 || baud > 115200)
-		baud = 115200;
 	msm_set_baud_rate(port, baud);
 
 	msm_reset(port);
-- 
1.7.10.4

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