firmware loader: cache devices firmware during suspend/resume cycle (07646d9c) · Commits · 戴 / test

drivers/base/firmware_class.c

+32 −0

Original line number	Diff line number	Diff line
		@@ -24,6 +24,7 @@
		#include <linux/list.h>
		#include <linux/async.h>
		#include <linux/pm.h>
		#include <linux/suspend.h>

		#include "base.h"
		#include "power/power.h"
		@@ -108,6 +109,8 @@ struct firmware_cache {
		wait_queue_head_t wait_queue;
		int cnt;
		struct delayed_work work;

		struct notifier_block pm_notify;
		};

		struct firmware_buf {
		@@ -1217,6 +1220,31 @@ static void device_uncache_fw_images_delay(unsigned long delay)
		msecs_to_jiffies(delay));
		}

		#ifdef CONFIG_PM
		static int fw_pm_notify(struct notifier_block *notify_block,
		unsigned long mode, void *unused)
		{
		switch (mode) {
		case PM_HIBERNATION_PREPARE:
		case PM_SUSPEND_PREPARE:
		device_cache_fw_images();
		break;

		case PM_POST_SUSPEND:
		case PM_POST_HIBERNATION:
		case PM_POST_RESTORE:
		device_uncache_fw_images_delay(10 * MSEC_PER_SEC);
		break;
		}

		return 0;
		}
		#else
		static int fw_pm_notify(struct notifier_block *notify_block,
		unsigned long mode, void *unused)
		{}
		#endif

		static void __init fw_cache_init(void)
		{
		spin_lock_init(&fw_cache.lock);
		@@ -1229,6 +1257,9 @@ static void __init fw_cache_init(void)
		init_waitqueue_head(&fw_cache.wait_queue);
		INIT_DELAYED_WORK(&fw_cache.work,
		device_uncache_fw_images_work);

		fw_cache.pm_notify.notifier_call = fw_pm_notify;
		register_pm_notifier(&fw_cache.pm_notify);
		}

		static int __init firmware_class_init(void)
		@@ -1239,6 +1270,7 @@ static int __init firmware_class_init(void)

		static void __exit firmware_class_exit(void)
		{
		unregister_pm_notifier(&fw_cache.pm_notify);
		class_unregister(&firmware_class);
		}