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pinctrl: core: Warn about NULL gpio_chip in pinctrl_ready_for_gpio_range()

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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>
This commit is contained in:
Tony Lindgren 2015-09-03 10:34:30 -07:00 committed by Linus Walleij
parent 163dc9f39a
commit 942cde7240
1 changed files with 3 additions and 0 deletions
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3
drivers/pinctrl/core.c
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@ -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 */