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When a new connection is established the RDMA CM creates a new cm_id and passes it through to the event handler. However inside the UCMA the new ID is not assigned a ucma_context until the user retrieves the event from a syscall. This creates a weird edge condition where a cm_id's context can continue to point at the listening_id that created it, and a number of additional edge conditions on event list clean up related to destroying half created IDs. There is also a race condition in ucma_get_events() where the cm_id->context is being assigned without holding the handler_mutex. Simplify all of this by creating the ucma_context inside the event handler itself and eliminating the edge case of a half created cm_id. All cm_id's can be uniformly destroyed via __destroy_id() or via the close_work. Link: https://lore.kernel.org/r/20200818120526.702120-14-leon@kernel.org Signed-off-by: Leon Romanovsky <leonro@mellanox.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com> |
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