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path: root/drivers/base/power/suspend.c
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Diffstat (limited to 'drivers/base/power/suspend.c')
-rw-r--r--drivers/base/power/suspend.c33
1 files changed, 29 insertions, 4 deletions
diff --git a/drivers/base/power/suspend.c b/drivers/base/power/suspend.c
index a0b5cf689e6..2ccee3763ac 100644
--- a/drivers/base/power/suspend.c
+++ b/drivers/base/power/suspend.c
@@ -39,13 +39,27 @@ int suspend_device(struct device * dev, pm_message_t state)
{
int error = 0;
- dev_dbg(dev, "suspending\n");
+ down(&dev->sem);
+ if (dev->power.power_state) {
+ dev_dbg(dev, "PM: suspend %d-->%d\n",
+ dev->power.power_state, state);
+ }
+ if (dev->power.pm_parent
+ && dev->power.pm_parent->power.power_state) {
+ dev_err(dev,
+ "PM: suspend %d->%d, parent %s already %d\n",
+ dev->power.power_state, state,
+ dev->power.pm_parent->bus_id,
+ dev->power.pm_parent->power.power_state);
+ }
dev->power.prev_state = dev->power.power_state;
- if (dev->bus && dev->bus->suspend && !dev->power.power_state)
+ if (dev->bus && dev->bus->suspend && !dev->power.power_state) {
+ dev_dbg(dev, "suspending\n");
error = dev->bus->suspend(dev, state);
-
+ }
+ up(&dev->sem);
return error;
}
@@ -100,8 +114,19 @@ int device_suspend(pm_message_t state)
put_device(dev);
}
up(&dpm_list_sem);
- if (error)
+ if (error) {
+ /* we failed... before resuming, bring back devices from
+ * dpm_off_irq list back to main dpm_off list, we do want
+ * to call resume() on them, in case they partially suspended
+ * despite returning -EAGAIN
+ */
+ while (!list_empty(&dpm_off_irq)) {
+ struct list_head * entry = dpm_off_irq.next;
+ list_del(entry);
+ list_add(entry, &dpm_off);
+ }
dpm_resume();
+ }
up(&dpm_sem);
return error;
}