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| author | Krzysztof Kozlowski <k.kozlowski@samsung.com> | 2015-03-12 10:44:12 +0300 |
|---|---|---|
| committer | Sebastian Reichel <sre@kernel.org> | 2015-03-14 01:15:52 +0300 |
| commit | 1a352462b5377ac68f5955d674b3460c7bac52a3 (patch) | |
| tree | b2dbecd8b038ccaddd262af47efa4fdf64c75696 /include/linux/power_supply.h | |
| parent | 297d716f6260cc9421d971b124ca196b957ee458 (diff) | |
| download | linux-1a352462b5377ac68f5955d674b3460c7bac52a3.tar.xz | |
power_supply: Add power_supply_put for decrementing device reference counter
The power_supply_get_by_phandle() and power_supply_get_by_name() use
function class_find_device() for obtaining the reference to power
supply. Each use of class_find_device() increases the power supply's
device reference counter.
However the reference counter was not decreased by users of this API.
Thus final device_unregister() call from power_supply_unregister() could
not release the device and clean up its resources. This lead to memory
leak if at least once power_supply_get_by_*() was called between
registering and unregistering the power supply.
Add and document new API power_supply_put() for decrementing the
reference counter.
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Reviewed-by: Sebastian Reichel <sre@kernel.org>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
Diffstat (limited to 'include/linux/power_supply.h')
| -rw-r--r-- | include/linux/power_supply.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h index ea15eb68f609..75a1dd8dc56e 100644 --- a/include/linux/power_supply.h +++ b/include/linux/power_supply.h @@ -282,6 +282,7 @@ extern struct atomic_notifier_head power_supply_notifier; extern int power_supply_reg_notifier(struct notifier_block *nb); extern void power_supply_unreg_notifier(struct notifier_block *nb); extern struct power_supply *power_supply_get_by_name(const char *name); +extern void power_supply_put(struct power_supply *psy); #ifdef CONFIG_OF extern struct power_supply *power_supply_get_by_phandle(struct device_node *np, const char *property); |