RDMA/verbs: Check existence of function prior to accessing it
Update all the flows to ensure that function pointer exists prior to accessing it. This is much safer than checking the uverbs_ex_mask variable, especially since we know that test isn't working properly and will be removed in -next. This prevents a user triggereable oops. Signed-off-by: NLeon Romanovsky <leonro@mellanox.com> Signed-off-by: NJason Gunthorpe <jgg@mellanox.com>
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