linux-kernel - [ 19/27] gpio: fix wrong checking condition for gpio range

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Date:	Sun, 14 Apr 2013 19:43:18 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Haojian Zhuang <haojian.zhuang@...aro.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Jonghwan Choi <jhbird.choi@...sung.com>
Subject: [ 19/27] gpio: fix wrong checking condition for gpio range

3.8-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Haojian Zhuang <haojian.zhuang@...aro.org>

commit ad4e1a7caf937ad395ced585ca85a7d14395dc80 upstream.

If index++ calculates from 0, the checking condition of "while
(index++)" fails & it doesn't check any more. It doesn't follow
the loop that used at here.

Replace it by endless loop at here. Then it keeps parsing
"gpio-ranges" property until it ends.

Signed-off-by: Haojian Zhuang <haojian.zhuang@...aro.org>
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Jonghwan Choi <jhbird.choi@...sung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpio/gpiolib-of.c |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

--- a/drivers/gpio/gpiolib-of.c
+++ b/drivers/gpio/gpiolib-of.c
@@ -228,7 +228,7 @@ static void of_gpiochip_add_pin_range(st
 	if (!np)
 		return;
 
-	do {
+	for (;; index++) {
 		ret = of_parse_phandle_with_args(np, "gpio-ranges",
 				"#gpio-range-cells", index, &pinspec);
 		if (ret)
@@ -257,8 +257,7 @@ static void of_gpiochip_add_pin_range(st
 
 		if (ret)
 			break;
-
-	} while (index++);
+	}
 }
 
 #else


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