IB/mlx5: Resolve soft lock on massive reg MRs

IB/mlx5: Resolve soft lock on massive reg MRs

When calling reg_mr of large MRs (e.g. 4GB) from multiple processes
and MR caches can't supply the required amount of MRs the slow-path
of MR allocation may be used. In this case we need to serialize the
slow-path between the processes to avoid soft lock.

Fixes: e126ba97dba9 ('mlx5: Add driver for Mellanox Connect-IB adapters')
Signed-off-by: Moshe Lazer <[email protected]>
Signed-off-by: Maor Gottlieb <[email protected]>
Reviewed-by: Eli Cohen <[email protected]>
Signed-off-by: Leon Romanovsky <[email protected]>
Signed-off-by: Doug Ledford <[email protected]>