RDMA/cma: Protect against adding device during destruction
Closes a window where address resolution can attach an rdma_cm_id to a device during destruction of the rdma_cm_id. This can result in the rdma_cm_id remaining in the device list after its memory has been freed. Signed-off-by: NSean Hefty <sean.hefty@intel.com> Signed-off-by: NRoland Dreier <rolandd@cisco.com>
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