RDMA/ucma: Use refcount_t for the ctx->ref
Don't use an atomic as a refcount. Link: https://lore.kernel.org/r/20200218191657.GA29724@ziepe.caReviewed-by: NLeon Romanovsky <leonro@mellanox.com> Signed-off-by: NJason Gunthorpe <jgg@mellanox.com>
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