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power_supply: Increment power supply use counter when obtaining refer…
…ences Increment the power_supply.use_cnt usage counter on: - power_supply_get_by_phandle() - power_supply_get_by_name() and decrement it on power_supply_put() call. This helps tracking of valid usage of power supply instance by consumers. The usage counter itself also allows safe calling of power_supply_get_property-like functions even when driver unregisters this power supply. Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> Signed-off-by: Sebastian Reichel <sre@kernel.org>
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