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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 4/7] regulator: push allocation in set_consumer_device_supply() out of lock
Date: Tue, 11 Aug 2020 03:07:39 +0200	[thread overview]
Message-ID: <2a978483b064b810b00e072fcdb6c3d24a896bd8.1597107682.git.mirq-linux@rere.qmqm.pl> (raw)
In-Reply-To: <cover.1597107682.git.mirq-linux@rere.qmqm.pl>

Pull regulator_list_mutex into set_consumer_device_supply() and keep
allocations outside of it. Fourth of the fs_reclaim deadlock case.

Cc: stable@vger.kernel.org
Fixes: 45389c47526d ("regulator: core: Add early supply resolution for regulators")
Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
---
 drivers/regulator/core.c | 44 +++++++++++++++++++++++-----------------
 1 file changed, 25 insertions(+), 19 deletions(-)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index c95397798275..0408c4e1d9a8 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1445,6 +1445,22 @@ static int set_consumer_device_supply(struct regulator_dev *rdev,
 	else
 		has_dev = 0;
 
+	node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
+	if (node == NULL)
+		return -ENOMEM;
+
+	node->regulator = rdev;
+	node->supply = supply;
+
+	if (has_dev) {
+		node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
+		if (node->dev_name == NULL) {
+			kfree(node);
+			return -ENOMEM;
+		}
+	}
+
+	mutex_lock(&regulator_list_mutex);
 	list_for_each_entry(node, &regulator_map_list, list) {
 		if (node->dev_name && consumer_dev_name) {
 			if (strcmp(node->dev_name, consumer_dev_name) != 0)
@@ -1462,26 +1478,19 @@ static int set_consumer_device_supply(struct regulator_dev *rdev,
 			 node->regulator->desc->name,
 			 supply,
 			 dev_name(&rdev->dev), rdev_get_name(rdev));
-		return -EBUSY;
-	}
-
-	node = kzalloc(sizeof(struct regulator_map), GFP_KERNEL);
-	if (node == NULL)
-		return -ENOMEM;
-
-	node->regulator = rdev;
-	node->supply = supply;
-
-	if (has_dev) {
-		node->dev_name = kstrdup(consumer_dev_name, GFP_KERNEL);
-		if (node->dev_name == NULL) {
-			kfree(node);
-			return -ENOMEM;
-		}
+		goto fail;
 	}
 
 	list_add(&node->list, &regulator_map_list);
+	mutex_unlock(&regulator_list_mutex);
+
 	return 0;
+
+fail:
+	mutex_unlock(&regulator_list_mutex);
+	kfree(node->dev_name);
+	kfree(node);
+	return -EBUSY;
 }
 
 static void unset_regulator_supplies(struct regulator_dev *rdev)
@@ -5239,19 +5248,16 @@ regulator_register(const struct regulator_desc *regulator_desc,
 
 	/* add consumers devices */
 	if (init_data) {
-		mutex_lock(&regulator_list_mutex);
 		for (i = 0; i < init_data->num_consumer_supplies; i++) {
 			ret = set_consumer_device_supply(rdev,
 				init_data->consumer_supplies[i].dev_name,
 				init_data->consumer_supplies[i].supply);
 			if (ret < 0) {
-				mutex_unlock(&regulator_list_mutex);
 				dev_err(dev, "Failed to set supply %s\n",
 					init_data->consumer_supplies[i].supply);
 				goto unset_supplies;
 			}
 		}
-		mutex_unlock(&regulator_list_mutex);
 	}
 
 	if (!rdev->desc->ops->get_voltage &&
-- 
2.20.1


  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 ` Michał Mirosław [this message]
2020-08-11  5:23   ` [PATCH 4/7] regulator: push allocation in set_consumer_device_supply() " 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 ` [PATCH 7/7] regulator: remove superfluous lock in regulator_resolve_coupling() Michał Mirosław
2020-08-11 15:56   ` Dmitry Osipenko

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