linux-kernel - Re: [PATCH net-next,v7] net: mana: Add handler for hardware servicing events

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Message-ID: <20250612182143.16f857a9@kernel.org>
Date: Thu, 12 Jun 2025 18:21:43 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Haiyang Zhang <haiyangz@...ux.microsoft.com>
Cc: linux-hyperv@...r.kernel.org, netdev@...r.kernel.org,
 haiyangz@...rosoft.com, decui@...rosoft.com, stephen@...workplumber.org,
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 vkuznets@...hat.com, davem@...emloft.net, wei.liu@...nel.org,
 edumazet@...gle.com, pabeni@...hat.com, leon@...nel.org,
 longli@...rosoft.com, ssengar@...ux.microsoft.com,
 linux-rdma@...r.kernel.org, daniel@...earbox.net, john.fastabend@...il.com,
 bpf@...r.kernel.org, ast@...nel.org, hawk@...nel.org, tglx@...utronix.de,
 shradhagupta@...ux.microsoft.com, andrew+netdev@...n.ch,
 kotaranov@...rosoft.com, horms@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next,v7] net: mana: Add handler for hardware
 servicing events

On Tue, 10 Jun 2025 11:42:22 -0700 Haiyang Zhang wrote:
> v6:
> Not acquiring module refcnt as suggested by Paolo Abeni.

TBH I'm not 100% sure this is correct.
If the service worker operations end up unbinding the driver from
the device holding the device ref may not prevent the module from
being unloaded.

Could you try to trigger that condition? Make that msleep() in the work
even longer and try to remove the module while the work is sleeping
there?