From 942cde724075f840ded89390b10dce1a47a4d712 Mon Sep 17 00:00:00 2001
From: Tony Lindgren <tony@atomide.com>
Date: Thu, 3 Sep 2015 10:34:30 -0700
Subject: [PATCH] pinctrl: core: Warn about NULL gpio_chip in
 pinctrl_ready_for_gpio_range()

If the gpio driver is confused about the numbers for gpio-ranges,
pinctrl_ready_for_gpio_range() may get called with invalid GPIO
causing a NULL pointer exception. Let's instead provide a warning
that allows fixing the problem and return with error.

Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 drivers/pinctrl/core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c
index 69723e07036b..9638a00c67c2 100644
--- a/drivers/pinctrl/core.c
+++ b/drivers/pinctrl/core.c
@@ -349,6 +349,9 @@ static bool pinctrl_ready_for_gpio_range(unsigned gpio)
 	struct pinctrl_gpio_range *range = NULL;
 	struct gpio_chip *chip = gpio_to_chip(gpio);
 
+	if (WARN(!chip, "no gpio_chip for gpio%i?", gpio))
+		return false;
+
 	mutex_lock(&pinctrldev_list_mutex);
 
 	/* Loop over the pin controllers */
-- 
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