[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 :)