linux-kernel - Re: [PATCH v4 6/8] nvme-fc: fix controller reset hang during traffic

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Date:   Tue, 10 Aug 2021 18:05:04 -0700
From:   Sagi Grimberg <sagi@...mberg.me>
To:     Daniel Wagner <dwagner@...e.de>, Hannes Reinecke <hare@...e.de>
Cc:     linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
        James Smart <james.smart@...adcom.com>,
        Keith Busch <kbusch@...nel.org>,
        Ming Lei <ming.lei@...hat.com>,
        Wen Xiong <wenxiong@...ibm.com>,
        James Smart <jsmart2021@...il.com>
Subject: Re: [PATCH v4 6/8] nvme-fc: fix controller reset hang during traffic


> On Wed, Aug 04, 2021 at 09:23:49AM +0200, Hannes Reinecke wrote:
>> There still is now an imbalance, as we're always calling
>> 'nvme_unfreeze()' (irrespective on the number of queues), but will only
>> call 'nvme_start_freeze()' if we have more than one queue.
>>
>> This might lead to an imbalance on the mq_freeze_depth counter.
>> Wouldn't it be better to move the call to 'nvme_start_freeze()' out of
>> the if() condition to avoid the imbalance?
> 
> What about something like nmve_is_frozen() which would avoid the tracking
> of the queue state open coded as it is right?

Why is there a conditional freeze?