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regulator: core: simplify _regulator_get() 

The code in _regulator_get() got a bit confusing over time, with control
flow jumping to a label from couple of places. Let's untangle it a bit by
doing the following:

1. Make handling of missing supplies and substituting them with dummy
regulators more explicit:

- check if we not have full constraints and refuse considering dummy
  regulators with appropriate message;

- use "switch (get_type)" to handle different types of request explicitly
  as well. "Normal" requests will get dummies, exclusive will not and
  will notify user about that; optional will fail silently.

2. Stop jumping to a label in the middle of the function but instead have
proper conditional flow. I believe jumps should be reserved for error
handling, breaking from inner loop, or restarting a loop, but not for
implementing normal conditional flow.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Dmitry Torokhov 2017-02-06 19:56:14 -08:00 committed by Mark Brown
parent 163478dae0
commit a4d7641fa7
1 changed files with 34 additions and 32 deletions
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66
drivers/regulator/core.c
View File

@ -1588,7 +1588,7 @@ struct regulator *_regulator_get(struct device *dev, const char *id,
{
struct regulator_dev *rdev;
struct regulator *regulator;
const char *devname = NULL;
const char *devname = dev ? dev_name(dev) : "deviceless";
int ret;
if (get_type >= MAX_GET_TYPE) {
@ -1601,45 +1601,47 @@ struct regulator *_regulator_get(struct device *dev, const char *id,
return ERR_PTR(-EINVAL);
}
if (dev)
devname = dev_name(dev);
rdev = regulator_dev_lookup(dev, id);
if (!IS_ERR(rdev))
goto found;
if (IS_ERR(rdev)) {
ret = PTR_ERR(rdev);
ret = PTR_ERR(rdev);
regulator = ERR_PTR(ret);
/*
* If regulator_dev_lookup() fails with error other
* than -ENODEV our job here is done, we simply return it.
*/
if (ret != -ENODEV)
return ERR_PTR(ret);
/*
* If we have return value from dev_lookup fail, we do not expect to
* succeed, so, quit with appropriate error value
*/
if (ret && ret != -ENODEV)
return regulator;
if (!have_full_constraints()) {
dev_warn(dev,
"incomplete constraints, dummy supplies not allowed\n");
return ERR_PTR(-ENODEV);
}
if (!devname)
devname = "deviceless";
switch (get_type) {
case NORMAL_GET:
/*
* Assume that a regulator is physically present and
* enabled, even if it isn't hooked up, and just
* provide a dummy.
*/
dev_warn(dev,
"%s supply %s not found, using dummy regulator\n",
devname, id);
rdev = dummy_regulator_rdev;
get_device(&rdev->dev);
break;
/*
* Assume that a regulator is physically present and enabled
* even if it isn't hooked up and just provide a dummy.
*/
if (have_full_constraints() && get_type == NORMAL_GET) {
pr_warn("%s supply %s not found, using dummy regulator\n",
devname, id);
case EXCLUSIVE_GET:
dev_warn(dev,
"dummy supplies not allowed for exclusive requests\n");
/* fall through */
rdev = dummy_regulator_rdev;
get_device(&rdev->dev);
goto found;
/* Don't log an error when called from regulator_get_optional() */
} else if (!have_full_constraints() || get_type == EXCLUSIVE_GET) {
dev_warn(dev, "dummy supplies not allowed\n");
default:
return ERR_PTR(-ENODEV);
}
}
return regulator;
found:
if (rdev->exclusive) {
regulator = ERR_PTR(-EPERM);
put_device(&rdev->dev);