From: Zev Weiss Date: Thu, 5 May 2022 04:31:52 +0000 (-0700) Subject: regulator: core: Fix enable_count imbalance with EXCLUSIVE_GET X-Git-Tag: v5.10.121~262 X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=369a712442f91fba0bf8ba84b0e88ffb32475dd4;p=users%2Fdwmw2%2Flinux.git regulator: core: Fix enable_count imbalance with EXCLUSIVE_GET [ Upstream commit c3e3ca05dae37f8f74bb80358efd540911cbc2c8 ] Since the introduction of regulator->enable_count, a driver that did an exclusive get on an already-enabled regulator would end up with enable_count initialized to 0 but rdev->use_count initialized to 1. With that starting point the regulator is effectively stuck enabled, because if the driver attempted to disable it it would fail the enable_count underflow check in _regulator_handle_consumer_disable(). The EXCLUSIVE_GET path in _regulator_get() now initializes enable_count along with rdev->use_count so that the regulator can be disabled without underflowing the former. Signed-off-by: Zev Weiss Fixes: 5451781dadf85 ("regulator: core: Only count load for enabled consumers") Link: https://lore.kernel.org/r/20220505043152.12933-1-zev@bewilderbeest.net Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index 2c48e55c4104e..6e3f3511e7ddd 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -2027,10 +2027,13 @@ struct regulator *_regulator_get(struct device *dev, const char *id, rdev->exclusive = 1; ret = _regulator_is_enabled(rdev); - if (ret > 0) + if (ret > 0) { rdev->use_count = 1; - else + regulator->enable_count = 1; + } else { rdev->use_count = 0; + regulator->enable_count = 0; + } } link = device_link_add(dev, &rdev->dev, DL_FLAG_STATELESS);