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We currently free sync when we find job list empty If aggressive_sync is set to true, we try to free sync during channel unbind() call But we rarely free sync from channel_unbind() call since freeing it when job list is empty is aggressive enough Hence remove sync free code from channel_unbind() Implement refcounting for sync: - get a refcount while submitting a job (and allocate sync if it is not allocated already) - put a refcount while freeing the job - if refcount==0 and if aggressive_sync_destroy is set, free the sync - if aggressive_sync_destroy is not set, we will free the sync during channel close time Bug 200187553 Change-Id: I74e24adb15dc26a375ebca1fdd017b3ad6d57b61 Signed-off-by: Deepak Nibade <dnibade@nvidia.com> Reviewed-on: http://git-master/r/1120410 Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com> Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>