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greybus: timesync: Rework timesync removal serialization logic

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We need to make sure we adequately cancel and quiesce any scheduled
TimeSync synchronization operations in the case of greybus.ko being yanked
out of memory i.e. when doing an EHCI runtime suspend or just a plain
rmmod. The scenario is a new TimeSync sync operation has been scheduled.
Next gb_timesync_svc_remove() runs. In this case we should terminate any
scheduled work, terminate our ktime tracking timer and state transition to
GB_TIMESYNC_STATE_INVALID to ensure no other context may schedule any new
TimeSync operations.

Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Reviewed-by: Vaibhav Hiremath <vaibhav.hiremath@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Bryan O'Donoghue 2016-06-16 13:42:16 +01:00 committed by Greg Kroah-Hartman
parent 0cc3bc6930
commit 93dbb97a3e
1 changed files with 2 additions and 2 deletions
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4
drivers/staging/greybus/timesync.c
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@ -1067,8 +1067,9 @@ void gb_timesync_svc_remove(struct gb_svc *svc)
mutex_lock(&timesync_svc->mutex);
gb_timesync_teardown(timesync_svc);
gb_timesync_set_state_atomic(timesync_svc, GB_TIMESYNC_STATE_INVALID);
del_timer_sync(&timesync_svc->ktime_timer);
gb_timesync_teardown(timesync_svc);
gb_timesync_hd_remove(timesync_svc, svc->hd);
list_for_each_entry_safe(timesync_interface, next,
@ -1076,7 +1077,6 @@ void gb_timesync_svc_remove(struct gb_svc *svc)
list_del(&timesync_interface->list);
kfree(timesync_interface);
}
gb_timesync_set_state_atomic(timesync_svc, GB_TIMESYNC_STATE_INVALID);
debugfs_remove(timesync_svc->frame_ktime_dentry);
debugfs_remove(timesync_svc->frame_time_dentry);
destroy_workqueue(timesync_svc->work_queue);