[PATCH 03/16] pinctrl: samsung: Detect and handle unsupported configuration types

[Tomasz Figa]

This patch modifies the pinctrl-samsung driver to detect when width of a
bit field is set to zero (which means that such configuraton type is not
supported) and return an error instead of trying to modify an inexistent
register.

Signed-off-by: Tomasz Figa <t.figa at samsung.com>
---
 drivers/pinctrl/pinctrl-samsung.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/pinctrl/pinctrl-samsung.c b/drivers/pinctrl/pinctrl-samsung.c
index dd108a9..c660fa5 100644
--- a/drivers/pinctrl/pinctrl-samsung.c
+++ b/drivers/pinctrl/pinctrl-samsung.c
@@ -391,6 +391,9 @@ static int samsung_pinconf_rw(struct pinctrl_dev *pctldev, unsigned int pin,
 		return -EINVAL;
 	}
 
+	if (!width)
+		return -EINVAL;
+
 	mask = (1 << width) - 1;
 	shift = pin_offset * width;
 	data = readl(reg_base + cfg_reg);
-- 
1.7.12