[PATCH 3/9] nvme: change namespaces_mutext to namespaces_rwsem

[Sagi Grimberg]

> namespaces_mutext is used to synchronize the operations on ctrl
> namespaces list. Most of the time, it is a read operation. It is
> better to change it from mutex to rwsem.
> 
> On the other hand, the namespaces mutex could introduce circular
> dependency easily.

On the other hand of what?

Also, can you give an example of such?