From: Javier Martinez Canillas Date: Wed, 15 Jul 2015 14:10:28 +0000 (+0200) Subject: regulator: core: Increase refcount for regulator supply's module X-Git-Tag: firefly_0821_release~176^2~1373^2^5~1 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=e2c09ae7a74d94222187edbe8f5cf1fa9364efcd;p=firefly-linux-kernel-4.4.55.git regulator: core: Increase refcount for regulator supply's module When a regulator is unregistered with regulator_unregister(), a call to regulator_put() is made for its input supply if there is one. This does a module_put() to decrement the refcount of the module that owns the supply but there isn't a corresponding try_module_get() in set_supply() to make the calls balanced. Signed-off-by: Javier Martinez Canillas Signed-off-by: Mark Brown --- diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index c9f72019bd68..934fde4faebe 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -1105,6 +1105,9 @@ static int set_supply(struct regulator_dev *rdev, rdev_info(rdev, "supplied by %s\n", rdev_get_name(supply_rdev)); + if (!try_module_get(supply_rdev->owner)) + return -ENODEV; + rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY"); if (rdev->supply == NULL) { err = -ENOMEM;