linux-kernel - Re: [PATCH 3/9] nvme: change namespaces_mutext to namespaces

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Message-ID: <4170b29e-693c-9c61-1b3b-716af09e44d0@grimberg.me>
Date:   Sun, 11 Feb 2018 13:17:56 +0200
From:   Sagi Grimberg <sagi@...mberg.me>
To:     Jianchao Wang <jianchao.w.wang@...cle.com>, keith.busch@...el.com,
        axboe@...com, hch@....de
Cc:     linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/9] nvme: change namespaces_mutext to namespaces_rwsem

> 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?