From: "Michał Mirosław" <mirq-linux@rere.qmqm.pl>
To: Dmitry Osipenko <digetx@gmail.com>,
Liam Girdwood <lgirdwood@gmail.com>,
Mark Brown <broonie@kernel.org>
Cc: linux-kernel@vger.kernel.org, Vladimir Zapolskiy <vz@mleia.com>
Subject: [PATCH 7/7] regulator: remove superfluous lock in regulator_resolve_coupling()
Date: Tue, 11 Aug 2020 03:07:41 +0200 [thread overview]
Message-ID: <169f98e7a2064a184167abc0f206f3a92513b8d8.1597107682.git.mirq-linux@rere.qmqm.pl> (raw)
In-Reply-To: <cover.1597107682.git.mirq-linux@rere.qmqm.pl>
The code modifies rdev, but locks c_rdev instead. The bug remains:
stored c_rdev could be freed just after unlock anyway. This doesn't blow
up because regulator_list_mutex taken outside holds it together.
Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
---
drivers/regulator/core.c | 4 ----
1 file changed, 4 deletions(-)
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index b85ec974944e..f8834559a2fb 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -4942,13 +4942,9 @@ static void regulator_resolve_coupling(struct regulator_dev *rdev)
return;
}
- regulator_lock(c_rdev);
-
c_desc->coupled_rdevs[i] = c_rdev;
c_desc->n_resolved++;
- regulator_unlock(c_rdev);
-
regulator_resolve_coupling(c_rdev);
}
}
--
2.20.1
next prev parent reply other threads:[~2020-08-11 1:07 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-11 1:07 [PATCH 0/7] regulator: fix deadlock vs memory reclaim Michał Mirosław
2020-08-11 1:07 ` [PATCH 1/7] regulator: push allocation in regulator_init_coupling() outside of lock Michał Mirosław
2020-08-11 15:59 ` Dmitry Osipenko
2020-08-11 16:27 ` Dmitry Osipenko
2020-08-11 17:20 ` Michał Mirosław
2020-08-11 21:02 ` Dmitry Osipenko
2020-08-11 1:07 ` [PATCH 3/7] regulator: push allocations in create_regulator() " Michał Mirosław
2020-08-11 1:07 ` [PATCH 2/7] regulator: push allocation in regulator_ena_gpio_request() out " Michał Mirosław
2020-08-11 1:07 ` [PATCH 4/7] regulator: push allocation in set_consumer_device_supply() " Michał Mirosław
2020-08-11 5:23 ` kernel test robot
2020-08-11 17:28 ` Michał Mirosław
2020-08-11 1:07 ` [PATCH 6/7] regulator: cleanup regulator_ena_gpio_free() Michał Mirosław
2020-08-11 1:07 ` [PATCH 5/7] regulator: plug of_node leak in regulator_register()'s error path Michał Mirosław
2020-08-11 6:15 ` Vladimir Zapolskiy
2020-08-11 1:07 ` Michał Mirosław [this message]
2020-08-11 15:56 ` [PATCH 7/7] regulator: remove superfluous lock in regulator_resolve_coupling() Dmitry Osipenko
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