From: Bruno Randolf <br1@einfach.org>
Date: Thu, 25 Sep 2008 14:45:10 +0000 (+0200)
Subject: [MIPS] au1000: Make sure GPIO value is zero or one
X-Git-Tag: v2.6.27-rc8~4^2~3
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=19506fc51852e859bb08ab5abbdb8fd02b7392f2;p=platform%2Fupstream%2Fkernel-adaptation-pc.git

[MIPS] au1000: Make sure GPIO value is zero or one

David Brownell <david-b@pacbell.net> wrote:
>       The problem is that "value" is zero-or-nonzero.
>       This code wrongly assumes it's zero-or-one.
>       Possible fix:  "((!!value) << gpio)".

Signed-off-by: Bruno Randolf <br1@einfach.org>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
---

diff --git a/arch/mips/au1000/common/gpio.c b/arch/mips/au1000/common/gpio.c
index 1f05843..e660ddd 100644
--- a/arch/mips/au1000/common/gpio.c
+++ b/arch/mips/au1000/common/gpio.c
@@ -48,7 +48,7 @@ static void au1xxx_gpio2_write(unsigned gpio, int value)
 {
 	gpio -= AU1XXX_GPIO_BASE;
 
-	gpio2->output = (GPIO2_OUTPUT_ENABLE_MASK << gpio) | (value << gpio);
+	gpio2->output = (GPIO2_OUTPUT_ENABLE_MASK << gpio) | ((!!value) << gpio);
 }
 
 static int au1xxx_gpio2_direction_input(unsigned gpio)
@@ -62,7 +62,7 @@ static int au1xxx_gpio2_direction_output(unsigned gpio, int value)
 {
 	gpio -= AU1XXX_GPIO_BASE;
 	gpio2->dir |= 0x01 << gpio;
-	gpio2->output = (GPIO2_OUTPUT_ENABLE_MASK << gpio) | (value << gpio);
+	gpio2->output = (GPIO2_OUTPUT_ENABLE_MASK << gpio) | ((!!value) << gpio);
 	return 0;
 }