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    Subject[PATCH v3 2/2] PM / Runtime: Add pm_runtime_enable_recursive
    Date
    This function makes less cumbersome to enable runtime PM in a device and
    its descendants.

    Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
    ---
    drivers/base/power/runtime.c | 15 +++++++++++++++
    include/linux/pm_runtime.h | 1 +
    2 files changed, 16 insertions(+)

    diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
    index 5070c4f..2c96f3f 100644
    --- a/drivers/base/power/runtime.c
    +++ b/drivers/base/power/runtime.c
    @@ -1189,6 +1189,21 @@ void pm_runtime_enable(struct device *dev)
    }
    EXPORT_SYMBOL_GPL(pm_runtime_enable);

    +static int __pm_runtime_enable_recursive(struct device *dev, void *data)
    +{
    + pm_runtime_enable(dev);
    +
    + device_for_each_child(dev, NULL, __pm_runtime_enable_recursive);
    +
    + return 0;
    +}
    +
    +void pm_runtime_enable_recursive(struct device *dev)
    +{
    + __pm_runtime_enable_recursive(dev, NULL);
    +}
    +EXPORT_SYMBOL_GPL(pm_runtime_enable_recursive);
    +
    /**
    * pm_runtime_forbid - Block runtime PM of a device.
    * @dev: Device to handle.
    diff --git a/include/linux/pm_runtime.h b/include/linux/pm_runtime.h
    index 30e84d4..d393ac3 100644
    --- a/include/linux/pm_runtime.h
    +++ b/include/linux/pm_runtime.h
    @@ -43,6 +43,7 @@ extern int pm_schedule_suspend(struct device *dev, unsigned int delay);
    extern int __pm_runtime_set_status(struct device *dev, unsigned int status);
    extern int pm_runtime_barrier(struct device *dev);
    extern void pm_runtime_enable(struct device *dev);
    +extern void pm_runtime_enable_recursive(struct device *dev);
    extern void __pm_runtime_disable(struct device *dev, bool check_resume);
    extern void pm_runtime_allow(struct device *dev);
    extern void pm_runtime_forbid(struct device *dev);
    --
    2.4.1


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