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regulator: don't require mutex for regulator_notifier_call_chain()

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Since 3801b86aa4 ("regulator: Refactor supply implementation
to work as regular consumers") we no longer cascade notifications
and so notifier head's built-in rwsem is enough to protect the
notifier chain. Remove the requirement to fix one case where
rdev->mutex might be forced to be taken recursively.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
Link: https://lore.kernel.org/r/5a0da9017c69a4dbc3f9b50f44476fce80a73387.1597032945.git.mirq-linux@rere.qmqm.pl
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Michał Mirosław 2020-08-10 06:33:32 +02:00 • committed by Mark Brown
parent 6656d4462c
commit 3bca239d61
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GPG key ID: 24D68B725D5487D0
1 changed files with 1 additions and 4 deletions

5
drivers/regulator/core.c
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@ -4725,14 +4725,11 @@ EXPORT_SYMBOL_GPL(regulator_bulk_free);
* @data: callback-specific data. * @data: callback-specific data.
* *
* Called by regulator drivers to notify clients a regulator event has * Called by regulator drivers to notify clients a regulator event has
* occurred. We also notify regulator clients downstream. * occurred.
* Note lock must be held by caller.
*/ */
int regulator_notifier_call_chain(struct regulator_dev *rdev, int regulator_notifier_call_chain(struct regulator_dev *rdev,
unsigned long event, void *data) unsigned long event, void *data)
{ {
lockdep_assert_held_once(&rdev->mutex.base);
_notifier_call_chain(rdev, event, data); _notifier_call_chain(rdev, event, data);
return NOTIFY_DONE; return NOTIFY_DONE;