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authorMing Lei <ming.lei@canonical.com>2012-08-17 22:06:59 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-08-17 07:37:35 -0700
commitdfe3212e0196c01402154971841463d721dea915 (patch)
tree0cb18c625b9d1b50999f8942e94be0689e1396a6 /drivers/base/power
parentc08f67730aba342b03f070209acc2990d3decf3c (diff)
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 <fengguang.wu@intel.com> Signed-off-by: Ming Lei <ming.lei@canonical.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/base/power')
-rw-r--r--drivers/base/power/main.c22
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index 0113adc310d..b0b072a88f5 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);