On Friday, August 17, 2012, Ming Lei wrote:
> dpm_list and its pm lock provide a good way to iterate all
> devices in system. Except this way, there is no other easy
> way to iterate devices in system.
>
> firmware loader need to cache firmware images for devices
> before system sleep, so introduce the function to meet its
> demand.
>
> Reported-by: Fengguang Wu <fengguang...@intel.com>
> Signed-off-by: Ming Lei <ming....@canonical.com>
Well.
> ---
> drivers/base/power/main.c | 22 ++++++++++++++++++++++
> include/linux/pm.h | 5 +++++
> 2 files changed, 27 insertions(+)
>
> diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
> index 57f5814..23b417f 100644
> --- a/drivers/base/power/main.c
> +++ b/drivers/base/power/main.c
> @@ -1349,3 +1349,25 @@ int device_pm_wait_for_dev(struct device *subordinate,
> struct device *dev)
> return async_error;
> }
> EXPORT_SYMBOL_GPL(device_pm_wait_for_dev);
> +
> +/**
> + * dpm_for_each_dev - device iterator.
> + * @data: data for the callback.
> + * @fn: function to be called for each device.
> + *
> + * Iterate over devices in dpm_list, and call @fn for each device,
> + * passing it @data.
> + */
> +void dpm_for_each_dev(void *data, void (*fn)(struct device *, void *))
Is this function actually used more than once?
> +{
> + struct device *dev;
> +
> + if (!fn)
> + return;
> +
> + device_pm_lock();
> + list_for_each_entry(dev, &dpm_list, power.entry)
> + fn(dev, data);
> + device_pm_unlock();
> +}
> +EXPORT_SYMBOL_GPL(dpm_for_each_dev);
> diff --git a/include/linux/pm.h b/include/linux/pm.h
> index 44d1f23..007e687 100644
> --- a/include/linux/pm.h
> +++ b/include/linux/pm.h
> @@ -640,6 +640,7 @@ extern void __suspend_report_result(const char *function,
> void *fn, int ret);
> } while (0)
>
> extern int device_pm_wait_for_dev(struct device *sub, struct device *dev);
> +extern void dpm_for_each_dev(void *data, void (*fn)(struct device *, void
> *));
>
> extern int pm_generic_prepare(struct device *dev);
> extern int pm_generic_suspend_late(struct device *dev);
> @@ -679,6 +680,10 @@ static inline int device_pm_wait_for_dev(struct device
> *a, struct device *b)
> return 0;
> }
>
> +static inline void dpm_for_each_dev(void *data, void (*fn)(struct device *,
> void *))
> +{
> +}
> +
> #define pm_generic_prepare NULL
> #define pm_generic_suspend NULL
> #define pm_generic_resume NULL
Rafael
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