[PATCH] nvme: mark ctrl as DEAD if removing from error recovery

[Sagi Grimberg]

>> namespace's request queue is frozen and quiesced during error recovering,
>> writeback IO is blocked in bio_queue_enter(), so fsync_bdev() <- 
>> del_gendisk()
>> can't move on, and causes IO hang. Removal could be from sysfs, hard
>> unplug or error handling.
>>
>> Fix this kind of issue by marking controller as DEAD if removal breaks
>> error recovery.
>>
>> This ways is reasonable too, because controller can't be recovered any
>> more after being removed.
> 
> This looks fine to me Ming,
> Reviewed-by: Sagi Grimberg <sagi at grimberg.me>
> 
> 
> I still want your patches for tcp/rdma that move the freeze.
> If you are not planning to send them, I swear I will :)

Ming, can you please send the tcp/rdma patches that move the
freeze? As I said before, it addresses an existing issue with
requests unnecessarily blocked on a frozen queue instead of
failing over.