regulator: core: Only increment use_count when enable_count changes

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[ Upstream commit 7993d3a9c3 ]

The use_count of a regulator should only be incremented when the
enable_count changes from 0 to 1. Similarly, the use_count should
only be decremented when the enable_count changes from 1 to 0.

In the previous implementation, use_count was sometimes decremented
to 0 when some consumer called unbalanced disable,
leading to unexpected disable even the regulator is enabled by
other consumers. With this change, the use_count accurately reflects
the number of users which the regulator is enabled.

This should make things more robust in the case where a consumer does
leak references.

Signed-off-by: Rui Zhang <zr.zhang@vivo.com>
Link: https://lore.kernel.org/r/20231103074231.8031-1-zr.zhang@vivo.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Rui Zhang 2023-11-03 15:42:31 +08:00 • committed by Greg Kroah-Hartman

parent d396f97648

commit 3023b44a30

1 changed files with 30 additions and 26 deletions

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drivers/regulator/core.c

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