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PM / sleep: make PM notifiers called symmetrically

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This makes pm notifier PREPARE/POST symmetrical: if PREPARE
fails, we will only undo what ever happened on PREPARE.

It fixes the unbalanced CPU hotplug enable in CPU PM notifier.

Signed-off-by: Lianwei Wang <lianwei.wang@gmail.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Lianwei Wang
2016-06-19 23:52:27 -07:00
committed by Rafael J. Wysocki
parent ca5f2b4c4f
commit ea00f4f4f0
5 changed files with 37 additions and 20 deletions
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11
kernel/power/main.c
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@@ -38,12 +38,19 @@ int unregister_pm_notifier(struct notifier_block *nb)
}
EXPORT_SYMBOL_GPL(unregister_pm_notifier);
int pm_notifier_call_chain(unsigned long val)
int __pm_notifier_call_chain(unsigned long val, int nr_to_call, int *nr_calls)
{
int ret = blocking_notifier_call_chain(&pm_chain_head, val, NULL);
int ret;
ret = __blocking_notifier_call_chain(&pm_chain_head, val, NULL,
nr_to_call, nr_calls);
return notifier_to_errno(ret);
}
int pm_notifier_call_chain(unsigned long val)
{
return __pm_notifier_call_chain(val, -1, NULL);
}
/* If set, devices may be suspended and resumed asynchronously. */
int pm_async_enabled = 1;