linux-kernel - [PATCH] pinctrl: fix error path in pinconf_map_to

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Date:	Mon, 12 Mar 2012 21:41:10 +0100
From:	Linus Walleij <linus.walleij@...ricsson.com>
To:	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
Cc:	Stephen Warren <swarren@...dia.com>,
	Shawn Guo <shawn.guo@...escale.com>,
	Thomas Abraham <thomas.abraham@...aro.org>,
	Dong Aisheng <dong.aisheng@...aro.org>,
	Rajendra Nayak <rajendra.nayak@...aro.org>,
	Haojian Zhuang <haojian.zhuang@...vell.com>,
	Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH] pinctrl: fix error path in pinconf_map_to_setting()

From: Linus Walleij <linus.walleij@...aro.org>

The code was using the union member
setting->data.configs.group_or_pin to store a potential
error code, but since that member is unsigned the
< 0 comparison was not true, letting errors pass thru,
ending up as mapped to pin "-22". Fix this up and print
the error.

Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
---
 drivers/pinctrl/pinconf.c |   27 +++++++++++++++++----------
 1 files changed, 17 insertions(+), 10 deletions(-)

diff --git a/drivers/pinctrl/pinconf.c b/drivers/pinctrl/pinconf.c
index 247b9f2..f9c9cd1 100644
--- a/drivers/pinctrl/pinconf.c
+++ b/drivers/pinctrl/pinconf.c
@@ -282,21 +282,28 @@ int pinconf_map_to_setting(struct pinctrl_map const *map,
 			  struct pinctrl_setting *setting)
 {
 	struct pinctrl_dev *pctldev = setting->pctldev;
+	int ret;
 
 	switch (setting->type) {
 	case PIN_MAP_TYPE_CONFIGS_PIN:
-		setting->data.configs.group_or_pin =
-			pin_get_from_name(pctldev,
-					  map->data.configs.group_or_pin);
-		if (setting->data.configs.group_or_pin < 0)
-			return setting->data.configs.group_or_pin;
+		ret = pin_get_from_name(pctldev,
+					map->data.configs.group_or_pin);
+		if (ret < 0) {
+			dev_err(pctldev->dev, "could not map pin config for \"%s\"",
+				map->data.configs.group_or_pin);
+			return ret;
+		}
+		setting->data.configs.group_or_pin = ret;
 		break;
 	case PIN_MAP_TYPE_CONFIGS_GROUP:
-		setting->data.configs.group_or_pin =
-			pinctrl_get_group_selector(pctldev,
-					map->data.configs.group_or_pin);
-		if (setting->data.configs.group_or_pin < 0)
-			return setting->data.configs.group_or_pin;
+		ret = pinctrl_get_group_selector(pctldev,
+					 map->data.configs.group_or_pin);
+		if (ret < 0) {
+			dev_err(pctldev->dev, "could not map group config for \"%s\"",
+				map->data.configs.group_or_pin);
+			return ret;
+		}
+		setting->data.configs.group_or_pin = ret;
 		break;
 	default:
 		return -EINVAL;
-- 
1.7.8

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