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regulator: core: Keep regulators-list locked while traversing the list 

It's unlikely that regulators may disappear/appear while regulators
debug-summary is being prepared, but let's be consistent and avoid that
situation.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Dmitry Osipenko 2018-11-19 00:56:19 +03:00 committed by Mark Brown
parent 089e2cc2e1
commit ff9b34b615
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GPG Key ID: 24D68B725D5487D0
1 changed files with 8 additions and 1 deletions
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9
drivers/regulator/core.c
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@ -4936,7 +4936,9 @@ void regulator_unregister(struct regulator_dev *rdev)
regulator_disable(rdev->supply);
regulator_put(rdev->supply);
}
mutex_lock(&regulator_list_mutex);
debugfs_remove_recursive(rdev->debugfs);
flush_work(&rdev->disable_work.work);
WARN_ON(rdev->open_count);
@ -4944,8 +4946,9 @@ void regulator_unregister(struct regulator_dev *rdev)
unset_regulator_supplies(rdev);
list_del(&rdev->list);
regulator_ena_gpio_free(rdev);
mutex_unlock(&regulator_list_mutex);
device_unregister(&rdev->dev);
mutex_unlock(&regulator_list_mutex);
}
EXPORT_SYMBOL_GPL(regulator_unregister);
@ -5278,6 +5281,8 @@ static void regulator_summary_lock(struct ww_acquire_ctx *ww_ctx)
struct regulator_dev *old_contended_rdev = NULL;
int err;
mutex_lock(&regulator_list_mutex);
ww_acquire_init(ww_ctx, &regulator_ww_class);
do {
@ -5304,6 +5309,8 @@ static void regulator_summary_unlock(struct ww_acquire_ctx *ww_ctx)
class_for_each_device(&regulator_class, NULL, NULL,
regulator_summary_unlock_one);
ww_acquire_fini(ww_ctx);
mutex_unlock(&regulator_list_mutex);
}
static int regulator_summary_show_roots(struct device *dev, void *data)