openwrt/target/linux/ipq806x/patches/0027-pinctrl-msm-Check-for-ngpios-MAX_NR_GPIO.patch

From 8341db7b05b688e8e5a93acd0e80b40be409d037 Mon Sep 17 00:00:00 2001
From: Stephen Boyd <sboyd@codeaurora.org>
Date: Thu, 6 Mar 2014 22:44:41 -0800
Subject: [PATCH 027/182] pinctrl: msm: Check for ngpios > MAX_NR_GPIO

Fail the probe and print a warning if SoC specific drivers have
more GPIOs than there can be accounted for in the static bitmaps.
This should avoid silent corruption/failures in the future.

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Acked-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 drivers/pinctrl/pinctrl-msm.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/drivers/pinctrl/pinctrl-msm.c
+++ b/drivers/pinctrl/pinctrl-msm.c
@@ -870,10 +870,14 @@ static int msm_gpio_init(struct msm_pinc
 	int ret;
 	int i;
 	int r;
+	unsigned ngpio = pctrl->soc->ngpios;
+
+	if (WARN_ON(ngpio > MAX_NR_GPIO))
+		return -EINVAL;
 
 	chip = &pctrl->chip;
 	chip->base = 0;
-	chip->ngpio = pctrl->soc->ngpios;
+	chip->ngpio = ngpio;
 	chip->label = dev_name(pctrl->dev);
 	chip->dev = pctrl->dev;
 	chip->owner = THIS_MODULE;