d6f19b4f0f
Present code uses lock-less accesses to the dump data to prevent top level ioctls from blocking bottom-level call to dump. Unfortunately, this depends on the type stability of the dump data structure, which makes it non-functional during driver teardown. Switch to the mutex locking scheme where top levels use the mutex in the bound regions, while copyouts and drain for completion utilize condvars. The mutex lifetime is guaranteed to be strictly larger than the time interval where driver can initiate dump, and most of the control fields of the old struct mlx5_dump_data are directly embedded into struct mlx5_core_dev. Submitted by: kib@ MFC after: 3 days Sponsored by: Mellanox Technologies
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