regulators: Modified ab8500 error handling

Error handling is updated to catch NULL pointer errors.

Signed-off-by: Bengt Jonsson <bengt.g.jonsson@stericsson.com>
Acked-by: Linus Walleij <linus.walleij@stericsson.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>

1 files changed, 31 insertions, 22 deletions

diff --git a/drivers/regulator/ab8500.c b/drivers/regulator/ab8500.c
index ccb0bfd71f23..2a15b6300e18 100644
--- a/drivers/regulator/ab8500.c
+++ b/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)) {