netdev - Re: [PATCH net-next 3/8] rtnetlink: do not depend on RTNL for IFLA

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Message-ID: <89e0117a970a56bc2de521bbc6f13dfe03b33373.camel@redhat.com>
Date: Tue, 07 May 2024 11:26:10 +0200
From: Paolo Abeni <pabeni@...hat.com>
To: Simon Horman <horms@...nel.org>, Eric Dumazet <edumazet@...gle.com>
Cc: "David S. Miller" <davem@...emloft.net>, Jakub Kicinski
 <kuba@...nel.org>,  netdev@...r.kernel.org, eric.dumazet@...il.com
Subject: Re: [PATCH net-next 3/8] rtnetlink: do not depend on RTNL for
 IFLA_TXQLEN output

On Sun, 2024-05-05 at 15:43 +0100, Simon Horman wrote:
> On Fri, May 03, 2024 at 07:20:54PM +0000, Eric Dumazet wrote:
> > rtnl_fill_ifinfo() can read dev->tx_queue_len locklessly,
> > granted we add corresponding READ_ONCE()/WRITE_ONCE() annotations.
> > 
> > Add missing READ_ONCE(dev->tx_queue_len) in teql_enqueue()
> 
> Hi Eric,
> 
> I am wondering if READ_ONCE(caifd->netdev->tx_queue_len)
> is also missing from net/caif/caif_dev.c:transmit().

I agree such read is outside the rtnl lock and could use a READ_ONCE
annotation. I think it's better to handle that as an eventual follow-up
instead of blocking this series.

Thanks,

Paolo