PM / hibernate: Fix restore hang in freeze_processes()

commit f8d5b9e9e5372f0deb7bc1ab1088a9b60b0a793d upstream.

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>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>

diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
index 10a4467..701212b 100644 (file)
--- a/drivers/base/firmware_class.c
+++ b/drivers/base/firmware_class.c
@@ -1529,6 +1529,7 @@ static int fw_pm_notify(struct notifier_block *notify_block,
        switch (mode) {
        case PM_HIBERNATION_PREPARE:
        case PM_SUSPEND_PREPARE:
+       case PM_RESTORE_PREPARE:
                kill_requests_without_uevent();
                device_cache_fw_images();
                break;