regulators: Modified ab8500 error handling

Error handling is updated to catch NULL pointer errors.
Signed-off-by: NBengt Jonsson <bengt.g.jonsson@stericsson.com>
Acked-by: NLinus Walleij <linus.walleij@stericsson.com>
Acked-by: NMark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: NLiam Girdwood <lrg@slimlogic.co.uk>

drivers/regulator/ab8500.c

@@ -100,12 +100,13 @@ static const int ldo_vintcore_voltages[] = {
 
 static int ab8500_regulator_enable(struct regulator_dev *rdev)
 {
-	int regulator_id, ret;
+	int ret;
 	struct ab8500_regulator_info *info = rdev_get_drvdata(rdev);
 
-	regulator_id = rdev_get_id(rdev);
-	if (regulator_id >= AB8500_NUM_REGULATORS)
+	if (info == NULL) {
+		dev_err(rdev_get_dev(rdev), "regulator info null pointer\n");
 		return -EINVAL;
+	}
 
 	ret = abx500_mask_and_set_register_interruptible(info->dev,
 		info->update_bank, info->update_reg,
@@ -118,12 +119,13 @@ static int ab8500_regulator_enable(struct regulator_dev *rdev)
 
 static int ab8500_regulator_disable(struct regulator_dev *rdev)
 {
-	int regulator_id, ret;
+	int ret;
 	struct ab8500_regulator_info *info = rdev_get_drvdata(rdev);
 
-	regulator_id = rdev_get_id(rdev);
-	if (regulator_id >= AB8500_NUM_REGULATORS)
+	if (info == NULL) {
+		dev_err(rdev_get_dev(rdev), "regulator info null pointer\n");
 		return -EINVAL;
+	}
 
 	ret = abx500_mask_and_set_register_interruptible(info->dev,
 		info->update_bank, info->update_reg,
@@ -136,13 +138,14 @@ static int ab8500_regulator_disable(struct regulator_dev *rdev)
 
 static int ab8500_regulator_is_enabled(struct regulator_dev *rdev)
 {
-	int regulator_id, ret;
+	int ret;
 	struct ab8500_regulator_info *info = rdev_get_drvdata(rdev);
 	u8 value;
 
-	regulator_id = rdev_get_id(rdev);
-	if (regulator_id >= AB8500_NUM_REGULATORS)
+	if (info == NULL) {
+		dev_err(rdev_get_dev(rdev), "regulator info null pointer\n");
 		return -EINVAL;
+	}
 
 	ret = abx500_get_register_interruptible(info->dev,
 		info->update_bank, info->update_reg, &value);
@@ -160,12 +163,12 @@ static int ab8500_regulator_is_enabled(struct regulator_dev *rdev)
 
 static int ab8500_list_voltage(struct regulator_dev *rdev, unsigned selector)
 {
-	int regulator_id;
 	struct ab8500_regulator_info *info = rdev_get_drvdata(rdev);
 
-	regulator_id = rdev_get_id(rdev);
-	if (regulator_id >= AB8500_NUM_REGULATORS)
+	if (info == NULL) {
+		dev_err(rdev_get_dev(rdev), "regulator info null pointer\n");
 		return -EINVAL;
+	}
 
 	/* return the uV for the fixed regulators */
 	if (info->fixed_uV)
@@ -179,13 +182,14 @@ static int ab8500_list_voltage(struct regulator_dev *rdev, unsigned selector)
 
 static int ab8500_regulator_get_voltage(struct regulator_dev *rdev)
 {
-	int regulator_id, ret;
+	int ret;
 	struct ab8500_regulator_info *info = rdev_get_drvdata(rdev);
 	u8 value;
 
-	regulator_id = rdev_get_id(rdev);
-	if (regulator_id >= AB8500_NUM_REGULATORS)
+	if (info == NULL) {
+		dev_err(rdev_get_dev(rdev), "regulator info null pointer\n");
 		return -EINVAL;
+	}
 
 	ret = abx500_get_register_interruptible(info->dev, info->voltage_bank,
 		info->voltage_reg, &value);
@@ -197,7 +201,7 @@ static int ab8500_regulator_get_voltage(struct regulator_dev *rdev)
 
 	/* vintcore has a different layout */
 	value &= info->voltage_mask;
-	if (regulator_id == AB8500_LDO_INTCORE)
+	if (info->desc.id == AB8500_LDO_INTCORE)
 		ret = info->voltages[value >> 0x3];
 	else
 		ret = info->voltages[value];
@@ -225,12 +229,13 @@ static int ab8500_regulator_set_voltage(struct regulator_dev *rdev,
 					int min_uV, int max_uV,
 					unsigned *selector)
 {
-	int regulator_id, ret;
+	int ret;
 	struct ab8500_regulator_info *info = rdev_get_drvdata(rdev);
 
-	regulator_id = rdev_get_id(rdev);
-	if (regulator_id >= AB8500_NUM_REGULATORS)
+	if (info == NULL) {
+		dev_err(rdev_get_dev(rdev), "regulator info null pointer\n");
 		return -EINVAL;
+	}
 
 	/* get the appropriate voltages within the range */
 	ret = ab8500_get_best_voltage_index(rdev, min_uV, max_uV);
@@ -264,12 +269,12 @@ static struct regulator_ops ab8500_regulator_ops = {
 
 static int ab8500_fixed_get_voltage(struct regulator_dev *rdev)
 {
-	int regulator_id;
 	struct ab8500_regulator_info *info = rdev_get_drvdata(rdev);
 
-	regulator_id = rdev_get_id(rdev);
-	if (regulator_id >= AB8500_NUM_REGULATORS)
+	if (info == NULL) {
+		dev_err(rdev_get_dev(rdev), "regulator info null pointer\n");
 		return -EINVAL;
+	}
 
 	return info->fixed_uV;
 }
@@ -368,6 +373,10 @@ static __devinit int ab8500_regulator_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 	pdata = dev_get_platdata(ab8500->dev);
+	if (!pdata) {
+		dev_err(&pdev->dev, "null pdata\n");
+		return -EINVAL;
+	}
 
 	/* make sure the platform data has the correct size */
 	if (pdata->num_regulator != ARRAY_SIZE(ab8500_regulator_info)) {