regulator: Copy config passed during registration

Copy the 'regulator_config' structure passed to regulator_register()
function so the driver could safely modify it after parsing init data.

The driver may want to change the config as a result of specific init
data parsed by regulator core (e.g. when core handled parsing device
tree).

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index e225711..c13b557 100644 (file)
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -3581,20 +3581,21 @@ static void rdev_init_debugfs(struct regulator_dev *rdev)
  */
 struct regulator_dev *
 regulator_register(const struct regulator_desc *regulator_desc,
-                  const struct regulator_config *config)
+                  const struct regulator_config *cfg)
 {
        const struct regulation_constraints *constraints = NULL;
        const struct regulator_init_data *init_data;
+       struct regulator_config *config = NULL;
        static atomic_t regulator_no = ATOMIC_INIT(0);
        struct regulator_dev *rdev;
        struct device *dev;
        int ret, i;
        const char *supply = NULL;
 
-       if (regulator_desc == NULL || config == NULL)
+       if (regulator_desc == NULL || cfg == NULL)
                return ERR_PTR(-EINVAL);
 
-       dev = config->dev;
+       dev = cfg->dev;
        WARN_ON(!dev);
 
        if (regulator_desc->name == NULL || regulator_desc->ops == NULL)
@@ -3624,6 +3625,16 @@ regulator_register(const struct regulator_desc *regulator_desc,
        if (rdev == NULL)
                return ERR_PTR(-ENOMEM);
 
+       /*
+        * Duplicate the config so the driver could override it after
+        * parsing init data.
+        */
+       config = kmemdup(cfg, sizeof(*cfg), GFP_KERNEL);
+       if (config == NULL) {
+               kfree(rdev);
+               return ERR_PTR(-ENOMEM);
+       }
+
        init_data = regulator_of_get_init_data(dev, regulator_desc,
                                               &rdev->dev.of_node);
        if (!init_data) {
@@ -3752,6 +3763,7 @@ add_dev:
        rdev_init_debugfs(rdev);
 out:
        mutex_unlock(&regulator_list_mutex);
+       kfree(config);
        return rdev;
 
 unset_supplies: