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    Subject[RFC 1/5] pm, runtime, Add resume notifier
    Date
    Asynchronous interface is provided for runtime PM, when the requested
    action (suspend/resume) is completed, the caller may need to be
    notified.

    Signed-off-by: Huang Ying <ying.huang@intel.com>
    ---
    drivers/base/power/runtime.c | 1 +
    include/linux/pm.h | 2 ++
    2 files changed, 3 insertions(+)

    --- a/drivers/base/power/runtime.c
    +++ b/drivers/base/power/runtime.c
    @@ -733,6 +733,7 @@ static int rpm_resume(struct device *dev
    atomic_inc(&parent->power.child_count);
    }
    wake_up_all(&dev->power.wait_queue);
    + atomic_notifier_call_chain(&dev->power.notifier, RPM_REQ_RESUME, dev);

    if (!retval)
    rpm_idle(dev, RPM_ASYNC);
    --- a/include/linux/pm.h
    +++ b/include/linux/pm.h
    @@ -27,6 +27,7 @@
    #include <linux/wait.h>
    #include <linux/timer.h>
    #include <linux/completion.h>
    +#include <linux/notifier.h>

    /*
    * Callbacks for platform drivers to implement.
    @@ -488,6 +489,7 @@ struct dev_pm_info {
    unsigned long timer_expires;
    struct work_struct work;
    wait_queue_head_t wait_queue;
    + struct atomic_notifier_head notifier;
    atomic_t usage_count;
    atomic_t child_count;
    unsigned int disable_depth:3;

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