pinctrl: exynos5440: Use off-stack memory for pinctrl_gpio_range

The range is registered into a linked list which can be referenced
throughout the lifetime of the driver. Ensure the range's memory is useful
for the same lifetime by adding it to the driver's private data structure.

The bug was introduced in the driver's initial commit, which was present in
v3.10.

Fixes: f0b9a7e521fa ("pinctrl: exynos5440: add pinctrl driver for Samsung EXYNOS5440 SoC")
Cc: stable@vger.kernel.org
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Acked-by: Tomasz Figa <tomasz.figa@gmail.com>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/pinctrl/samsung/pinctrl-exynos5440.c b/drivers/pinctrl/samsung/pinctrl-exynos5440.c
index 71f9f13e826d92672e75c17abeaccc83bf3fe484..fb71fc3e5aa040d1309c782b6f7ba68368566ec5 100644 (file)
--- a/drivers/pinctrl/samsung/pinctrl-exynos5440.c
+++ b/drivers/pinctrl/samsung/pinctrl-exynos5440.c
@@ -107,6 +107,7 @@ struct exynos5440_pmx_func {
  * @nr_groups: number of pin groups available.
  * @pmx_functions: list of pin functions parsed from device tree.
  * @nr_functions: number of pin functions available.
+ * @range: gpio range to register with pinctrl
  */
 struct exynos5440_pinctrl_priv_data {
        void __iomem                    *reg_base;
@@ -117,6 +118,7 @@ struct exynos5440_pinctrl_priv_data {
        unsigned int                    nr_groups;
        const struct exynos5440_pmx_func        *pmx_functions;
        unsigned int                    nr_functions;
+       struct pinctrl_gpio_range       range;
 };
 
 /**
@@ -742,7 +744,6 @@ static int exynos5440_pinctrl_register(struct platform_device *pdev,
        struct pinctrl_desc *ctrldesc;
        struct pinctrl_dev *pctl_dev;
        struct pinctrl_pin_desc *pindesc, *pdesc;
-       struct pinctrl_gpio_range grange;
        char *pin_names;
        int pin, ret;
 
@@ -794,12 +795,12 @@ static int exynos5440_pinctrl_register(struct platform_device *pdev,
                return PTR_ERR(pctl_dev);
        }
 
-       grange.name = "exynos5440-pctrl-gpio-range";
-       grange.id = 0;
-       grange.base = 0;
-       grange.npins = EXYNOS5440_MAX_PINS;
-       grange.gc = priv->gc;
-       pinctrl_add_gpio_range(pctl_dev, &grange);
+       priv->range.name = "exynos5440-pctrl-gpio-range";
+       priv->range.id = 0;
+       priv->range.base = 0;
+       priv->range.npins = EXYNOS5440_MAX_PINS;
+       priv->range.gc = priv->gc;
+       pinctrl_add_gpio_range(pctl_dev, &priv->range);
        return 0;
 }