[PATCH v3] nvmet-rdma: Correctly handle RDMA device hot removal

[Sagi Grimberg]

>>> How is ->remove_port synchronized vs the RDMA/CM even handler?
>>
>> Easy, it isn't :)
>>
>> So we have three choices here:
>> 1. Add a lock in nvmet_port that only rdma will use for now (don't like
>> it)
>> or
>> 2. Add nvmet_rdma_port as nvmet_port->priv with a lock (don't like it)
>> or
>> 3. take the global nvmet_config_sem (hate it)
>>
>> Any preferences?
>
> (4) use cmpxchg?

I'm not exactly sure what you mean. Do you mean placing
cmpxchg in nvmet_rdma_device_removal()? To what we cmp
when we want to xchg?

Care to explain in a bit more detail?