Commit a2151374 authored by Jon Hunter's avatar Jon Hunter Committed by Mark Brown

regulator: Fix deadlock during regulator registration

Commit 5e3ca2b3 ("regulator: Try to resolve regulators supplies on
registration") added a call to regulator_resolve_supply() within
regulator_register() where the regulator_list_mutex is held. This causes
a deadlock to occur on the Tegra114 Dalmore board when the palmas PMIC
is registered because regulator_register_resolve_supply() calls
regulator_dev_lookup() which may try to acquire the regulator_list_mutex
again.

Fix this by releasing the mutex before calling
regulator_register_resolve_supply() and update the error exit path to
ensure the mutex is released on an error.

[Made commit message more legible -- broonie]
Signed-off-by: default avatarJon Hunter <jonathanh@nvidia.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 5e3ca2b3
......@@ -3991,12 +3991,11 @@ regulator_register(const struct regulator_desc *regulator_desc,
}
rdev_init_debugfs(rdev);
mutex_unlock(&regulator_list_mutex);
/* try to resolve regulators supply since a new one was registered */
class_for_each_device(&regulator_class, NULL, NULL,
regulator_register_resolve_supply);
out:
mutex_unlock(&regulator_list_mutex);
kfree(config);
return rdev;
......@@ -4007,15 +4006,16 @@ regulator_register(const struct regulator_desc *regulator_desc,
regulator_ena_gpio_free(rdev);
device_unregister(&rdev->dev);
/* device core frees rdev */
rdev = ERR_PTR(ret);
goto out;
wash:
regulator_ena_gpio_free(rdev);
clean:
kfree(rdev);
rdev = ERR_PTR(ret);
goto out;
out:
mutex_unlock(&regulator_list_mutex);
kfree(config);
return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(regulator_register);
......
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