linux-kernel - Re: [PATCH net-next] devlink: Execute devlink health recover as a work

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Message-ID: <20190426043809.GC2271@nanopsycho.orion>
Date:   Fri, 26 Apr 2019 06:38:09 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc:     Moshe Shemesh <moshe@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jiri Pirko <jiri@...lanox.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] devlink: Execute devlink health recover as a
 work

Thu, Apr 25, 2019 at 11:38:47PM CEST, jakub.kicinski@...ronome.com wrote:
>On Thu, 25 Apr 2019 13:57:03 +0300, Moshe Shemesh wrote:
>> Different reporters have different rules in the driver and are being
>> created/destroyed during different stages of driver load/unload/running.
>> So during execution of a reporter recover the flow can go through
>> another reporter's destroy and create. Such flow leads to deadlock
>> trying to lock a mutex already held if the flow was triggered by devlink
>> recover command.
>> To avoid such deadlock, we execute the recover flow from a workqueue.
>> Once the recover work is done successfully the reporter health state and
>> recover counter are being updated.
>
>Naive question, why not just run the doit unlocked?  Why the async?

Hmm, you have a point here. That would be probably doable.