[PATCH] pinctrl: check ops->pin_config_set in pinconf_set_config()

[Masahiro Yamada]

pinconf_set_config() is called by pinctrl_gpio_set_config().
If a GPIO driver is backed by a pinctrl driver and it does not
support .pin_config_set() hook, it causes NULL pointer dereference.

Fixes: 15381bc7c7f5 ("pinctrl: Allow configuration of pins from gpiolib based 
drivers")
Signed-off-by: Masahiro Yamada <yamada.masah...@socionext.com>
---

 drivers/pinctrl/pinconf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pinctrl/pinconf.c b/drivers/pinctrl/pinconf.c
index 92f363793f35..d3fe14394b73 100644
--- a/drivers/pinctrl/pinconf.c
+++ b/drivers/pinctrl/pinconf.c
@@ -205,7 +205,7 @@ int pinconf_set_config(struct pinctrl_dev *pctldev, 
unsigned pin,
        const struct pinconf_ops *ops;
 
        ops = pctldev->desc->confops;
-       if (!ops)
+       if (!ops || !ops->pin_config_set)
                return -ENOTSUPP;
 
        return ops->pin_config_set(pctldev, pin, configs, nconfigs);
-- 
2.7.4