From dfe3212e0196c01402154971841463d721dea915 Mon Sep 17 00:00:00 2001 From: Ming Lei Date: Fri, 17 Aug 2012 22:06:59 +0800 Subject: PM / Sleep: introduce dpm_for_each_dev 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 Signed-off-by: Ming Lei Signed-off-by: Greg Kroah-Hartman --- drivers/base/power/main.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) (limited to 'drivers/base/power/main.c') diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c index 0113adc..b0b072a 100644 --- a/drivers/base/power/main.c +++ b/drivers/base/power/main.c @@ -1324,3 +1324,25 @@ 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 *)) +{ + 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); -- cgit v1.1