netdev - Re: [PATCH v7 net-next 14/15] iavf: Add net_shaper

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Message-ID: <20240910150337.6c397227@kernel.org>
Date: Tue, 10 Sep 2024 15:03:37 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org, Jiri Pirko <jiri@...nulli.us>, Madhu Chittim
 <madhu.chittim@...el.com>, Sridhar Samudrala <sridhar.samudrala@...el.com>,
 Simon Horman <horms@...nel.org>, John Fastabend <john.fastabend@...il.com>,
 Sunil Kovvuri Goutham <sgoutham@...vell.com>, Jamal Hadi Salim
 <jhs@...atatu.com>, Donald Hunter <donald.hunter@...il.com>,
 anthony.l.nguyen@...el.com, przemyslaw.kitszel@...el.com,
 intel-wired-lan@...ts.osuosl.org, edumazet@...gle.com
Subject: Re: [PATCH v7 net-next 14/15] iavf: Add net_shaper_ops support

On Tue, 10 Sep 2024 00:10:08 +0200 Paolo Abeni wrote:
> +	if (adapter->netdev->reg_state == NETREG_REGISTERED) {
> +		mutex_lock(&adapter->netdev->lock);
> +		devlock = true;
> +	}

This leads to a false positive in cocci.

Any concerns about moving the mutex_init() / _destroy() into
alloc_netdev_mqs() / free_netdev()?  I guess one could argue
that narrower scope of the lock being valid may help catching 
errors, but I think we'll instead end up with more checks like
the above sprinkled around than bugs caught?