[PATCH 2/2] pinctrl: stm32: check node status before new gpio bank registering

Alexandre Torgue
2018-07-16T12:57:37Z

Register a new GPIO bank only if GPIO bank node is enabled. This patch also
adds checks on ranges which are defined only if a bank is registered.

Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>

diff --git a/drivers/pinctrl/stm32/pinctrl-stm32.c b/drivers/pinctrl/stm32/pinctrl-stm32.c
index eb6ae14..111225e 100644
--- a/drivers/pinctrl/stm32/pinctrl-stm32.c
+++ b/drivers/pinctrl/stm32/pinctrl-stm32.c
@@ -639,6 +639,11 @@ static int stm32_pmx_set_mux(struct pinctrl_dev *pctldev,
}

range = pinctrl_find_gpio_range_from_pin(pctldev, g->pin);
+ if (!range) {
+ dev_err(pctl->dev, "No gpio range defined.\n");
+ return -EINVAL;
+ }
+
bank = gpiochip_get_data(range->gc);
pin = stm32_gpio_pin(g->pin);

@@ -807,11 +812,17 @@ static int stm32_pconf_parse_conf(struct pinctrl_dev *pctldev,
unsigned int pin, enum pin_config_param param,
enum pin_config_param arg)
{
+ struct stm32_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
struct pinctrl_gpio_range *range;
struct stm32_gpio_bank *bank;
int offset, ret = 0;

range = pinctrl_find_gpio_range_from_pin(pctldev, pin);
+ if (!range) {
+ dev_err(pctl->dev, "No gpio range defined.\n");
+ return -EINVAL;
+ }
+
bank = gpiochip_get_data(range->gc);
offset = stm32_gpio_pin(pin);

@@ -893,6 +904,9 @@ static void stm32_pconf_dbg_show(struct pinctrl_dev *pctldev,
bool val;

range = pinctrl_find_gpio_range_from_pin_nolock(pctldev, pin);
+ if (!range)
+ return;
+
bank = gpiochip_get_data(range->gc);
offset = stm32_gpio_pin(pin);

@@ -1173,7 +1187,7 @@ int stm32_pctl_probe(struct platform_device *pdev)
return PTR_ERR(pctl->pctl_dev);
}

- for_each_child_of_node(np, child)
+ for_each_available_child_of_node(np, child)
if (of_property_read_bool(child, "gpio-controller"))
banks++;

@@ -1186,7 +1200,7 @@ int stm32_pctl_probe(struct platform_device *pdev)
if (!pctl->banks)
return -ENOMEM;

- for_each_child_of_node(np, child) {
+ for_each_available_child_of_node(np, child) {
if (of_property_read_bool(child, "gpio-controller")) {
ret = stm32_gpiolib_register_bank(pctl, child);
if (ret)
--
2.7.4