linux-kernel - [PATCH 1/3] pwm: i.MX: Fix the macro MX3_PWMCR

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Message-ID: <1401274213-8954-1-git-send-email-Ying.Liu@freescale.com>
Date:	Wed, 28 May 2014 18:50:11 +0800
From:	Liu Ying <Ying.Liu@...escale.com>
To:	<linux-pwm@...r.kernel.org>
CC:	<thierry.reding@...il.com>, <s.hauer@...gutronix.de>,
	<shawn.guo@...escale.com>, <LW@...O-electronics.de>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
Subject: [PATCH 1/3] pwm: i.MX: Fix the macro MX3_PWMCR_PRESCALER(x) definition

This patch adds missing parentheses around the argument
of the macro MX3_PWMCR_PRESCALER(x) to avoid any potential
macro expansion issue.

Reported-by: Lothar Waßmann <LW@...O-electronics.de>
Cc: Thierry Reding <thierry.reding@...il.com>
Cc: Sascha Hauer <s.hauer@...gutronix.de>
Cc: Shawn Guo <shawn.guo@...escale.com>
Cc: Lothar Waßmann <LW@...O-electronics.de>
Cc: linux-pwm@...r.kernel.org
Cc: linux-arm-kernel@...ts.infradead.org
Signed-off-by: Liu Ying <Ying.Liu@...escale.com>
---
 drivers/pwm/pwm-imx.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pwm/pwm-imx.c b/drivers/pwm/pwm-imx.c
index cc47733..9835e0b 100644
--- a/drivers/pwm/pwm-imx.c
+++ b/drivers/pwm/pwm-imx.c
@@ -32,7 +32,7 @@
 #define MX3_PWMCR                 0x00    /* PWM Control Register */
 #define MX3_PWMSAR                0x0C    /* PWM Sample Register */
 #define MX3_PWMPR                 0x10    /* PWM Period Register */
-#define MX3_PWMCR_PRESCALER(x)    (((x - 1) & 0xFFF) << 4)
+#define MX3_PWMCR_PRESCALER(x)    ((((x) - 1) & 0xFFF) << 4)
 #define MX3_PWMCR_DOZEEN                (1 << 24)
 #define MX3_PWMCR_WAITEN                (1 << 23)
 #define MX3_PWMCR_DBGEN			(1 << 22)
-- 
1.7.9.5

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