[PATCH] Driver core: PM_DEBUG device suspend() messages become informative (fd869db6) · Commits · 戴 / test

This makes the driver model PM suspend debug messages more useful, by (a) explaining what event is being sent, since not all suspend() requests mean the same thing; (b) reporting when a PM_EVENT_SUSPEND call is allowing the device to issue wakeup events. Signed-off-by:

David Brownell <dbrownell@users.sourceforge.net> Signed-off-by:

Greg Kroah-Hartman <gregkh@suse.de>

drivers/base/power/suspend.c

+16 −1

Original line number	Diff line number	Diff line
		@@ -29,6 +29,15 @@
		* lists. This way, the ancestors will be accessed before their descendents.
		*/

		static inline char *suspend_verb(u32 event)
		{
		switch (event) {
		case PM_EVENT_SUSPEND: return "suspend";
		case PM_EVENT_FREEZE: return "freeze";
		default: return "(unknown suspend event)";
		}
		}


		/**
		* suspend_device - Save state of one device.
		@@ -57,7 +66,13 @@ int suspend_device(struct device * dev, pm_message_t state)
		dev->power.prev_state = dev->power.power_state;

		if (dev->bus && dev->bus->suspend && !dev->power.power_state.event) {
		dev_dbg(dev, "suspending\n");
		dev_dbg(dev, "%s%s\n",
		suspend_verb(state.event),
		((state.event == PM_EVENT_SUSPEND)
		&& device_may_wakeup(dev))
		? ", may wakeup"
		: ""
		);
		error = dev->bus->suspend(dev, state);
		suspend_report_result(dev->bus->suspend, error);
		}

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