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Commit fd869db6 authored by David Brownell's avatar David Brownell Committed by Greg Kroah-Hartman
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[PATCH] Driver core: PM_DEBUG device suspend() messages become informative 



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: default avatarDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 1e724845

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);

	}