pinctrl: axp209: dereference pointer after it's been set

The number of GPIOs is gotten from a field within the structure
referenced in the of_device.data but it was actually read before it was
retrieved, thus it was dereferencing a null pointer.

Set the number of GPIOs after retrieving of_device.data.

Fixes: e1190083b89b ("pinctrl: axp209: add support for AXP813 GPIOs")
Signed-off-by: Quentin Schulz <quentin.schulz@free-electrons.com>
Reported-by: Mylène Josserand <mylene.josserand@free-electrons.com>
Tested-by: Mylène Josserand <mylene.josserand@free-electrons.com>
Acked-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/pinctrl/pinctrl-axp209.c b/drivers/pinctrl/pinctrl-axp209.c
index 22d3bb0..510a282 100644 (file)
--- a/drivers/pinctrl/pinctrl-axp209.c
+++ b/drivers/pinctrl/pinctrl-axp209.c
@@ -413,9 +413,11 @@ static int axp20x_pctl_probe(struct platform_device *pdev)
        pctl->chip.set                  = axp20x_gpio_set;
        pctl->chip.direction_input      = axp20x_gpio_input;
        pctl->chip.direction_output     = axp20x_gpio_output;
-       pctl->chip.ngpio                = pctl->desc->npins;
 
        pctl->desc = (struct axp20x_pctrl_desc *)of_device_get_match_data(dev);
+
+       pctl->chip.ngpio                = pctl->desc->npins;
+
        pctl->regmap = axp20x->regmap;
        pctl->dev = &pdev->dev;