forked from luck/tmp_suning_uos_patched
PM / hibernate: Fix restore hang in freeze_processes()
During restore, pm_notifier chain are called with PM_RESTORE_PREPARE. The firmware_class driver handler fw_pm_notify does not have a handler for this. As a result, it keeps a reader on the kmod.c umhelper_sem. During freeze_processes, the call to __usermodehelper_disable tries to take a write lock on this semaphore and hangs waiting. Signed-off-by: Sebastian Capella <sebastian.capella@linaro.org> Acked-by: Ming Lei <ming.lei@canonical.com> Cc: All applicable <stable@vger.kernel.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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@ -1580,6 +1580,7 @@ static int fw_pm_notify(struct notifier_block *notify_block,
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switch (mode) {
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case PM_HIBERNATION_PREPARE:
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case PM_SUSPEND_PREPARE:
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case PM_RESTORE_PREPARE:
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kill_requests_without_uevent();
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device_cache_fw_images();
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break;
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