pinctrl: intel: merrifield: Add missed check in mrfld_config_set()

Not every pin can be configured. Add missed check to prevent access
violation.

Fixes: 4e80c8f50574 ("pinctrl: intel: Add Intel Merrifield pin controller support")
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/pinctrl/intel/pinctrl-merrifield.c b/drivers/pinctrl/intel/pinctrl-merrifield.c
index b218961..4d4ef42 100644 (file)
--- a/drivers/pinctrl/intel/pinctrl-merrifield.c
+++ b/drivers/pinctrl/intel/pinctrl-merrifield.c
@@ -794,6 +794,9 @@ static int mrfld_config_set(struct pinctrl_dev *pctldev, unsigned int pin,
        unsigned int i;
        int ret;
 
+       if (!mrfld_buf_available(mp, pin))
+               return -ENOTSUPP;
+
        for (i = 0; i < nconfigs; i++) {
                switch (pinconf_to_config_param(configs[i])) {
                case PIN_CONFIG_BIAS_DISABLE: