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| author | Zev Weiss <zev@bewilderbeest.net> | 2022-05-05 07:31:52 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-06-09 11:21:06 +0300 |
| commit | 369a712442f91fba0bf8ba84b0e88ffb32475dd4 (patch) | |
| tree | 4fd3290e41f328a36deab1b713caeee3cf8c8912 /drivers/regulator | |
| parent | 018ebe4c18107ef155ffbedcf81f2077997efde9 (diff) | |
| download | linux-369a712442f91fba0bf8ba84b0e88ffb32475dd4.tar.xz | |
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 <zev@bewilderbeest.net>
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 <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/regulator')
| -rw-r--r-- | drivers/regulator/core.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index 2c48e55c4104..6e3f3511e7dd 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); |