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[PATCH] Driver core: PM_DEBUG device suspend() messages become informative

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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>
This commit is contained in:
David Brownell 2006-05-16 17:03:25 -07:00 committed by Greg Kroah-Hartman
parent 1e72484503
commit fd869db6eb
1 changed files with 16 additions and 1 deletions
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17
drivers/base/power/suspend.c
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@ -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);
}