regulator: reorder initialization steps in regulator_register()

device_register() is calling ->get_voltage() as part of it's sysfs attribute
initialization process, and this functions might need to know the regulator
constraints to return a valid value.
This is at least true for the pwm regulator driver (when operating in
continuous mode) which needs to know the minimum and maximum voltage values
to calculate the current voltage:

min_uV + (((max_uV - min_uV) * dutycycle) / 100);

Move device_register() after set_machine_constraints() to make sure those
constraints are correctly initialized when ->get_voltage() is called.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Reported-by: Stephen Barber <smbarber@chromium.org>
Tested-by: Caesar Wang <wxt@rock-chips.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index e0b7642847731390ed44bbc3e8718fd5dd9e7116..8258568c793ada1cbe5946d42b99a7f945972934 100644 (file)
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -3950,13 +3950,6 @@ regulator_register(const struct regulator_desc *regulator_desc,
        rdev->dev.parent = dev;
        dev_set_name(&rdev->dev, "regulator.%lu",
                    (unsigned long) atomic_inc_return(&regulator_no));
-       ret = device_register(&rdev->dev);
-       if (ret != 0) {
-               put_device(&rdev->dev);
-               goto wash;
-       }
-
-       dev_set_drvdata(&rdev->dev, rdev);
 
        /* set regulator constraints */
        if (init_data)
@@ -3964,7 +3957,15 @@ regulator_register(const struct regulator_desc *regulator_desc,
 
        ret = set_machine_constraints(rdev, constraints);
        if (ret < 0)
-               goto scrub;
+               goto wash;
+
+       ret = device_register(&rdev->dev);
+       if (ret != 0) {
+               put_device(&rdev->dev);
+               goto wash;
+       }
+
+       dev_set_drvdata(&rdev->dev, rdev);
 
        if (init_data && init_data->supply_regulator)
                rdev->supply_name = init_data->supply_regulator;
@@ -3993,8 +3994,6 @@ out:
 
 unset_supplies:
        unset_regulator_supplies(rdev);
-
-scrub:
        regulator_ena_gpio_free(rdev);
        device_unregister(&rdev->dev);
        /* device core frees rdev */
@@ -4002,6 +4001,7 @@ scrub:
        goto out;
 
 wash:
+       kfree(rdev->constraints);
        regulator_ena_gpio_free(rdev);
 clean:
        kfree(rdev);