netdev - Re: [PATCH net-next] net: ppp: remove ppp->closing check

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Message-ID: <7e0df321-e297-4d32-aac5-a885de906ad5@redhat.com>
Date: Thu, 7 Nov 2024 13:08:39 +0100
From: Paolo Abeni <pabeni@...hat.com>
To: Qingfang Deng <dqfext@...il.com>, Andrew Lunn <andrew+netdev@...n.ch>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, linux-ppp@...r.kernel.org,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] net: ppp: remove ppp->closing check

On 11/4/24 10:24, Qingfang Deng wrote:
> ppp->closing was used to test if an interface is closing down. But upon
> .ndo_uninit() where ppp->closing is set to 1, dev_close() is already
> called to bring down an interface and a synchronize_net() guarantees
> that no pending TX/RX can take place, so the check is unnecessary.
> Remove the check.

I'm unsure we can remote such check. The TX callback can be triggered
even from a write on the controlling file, and it looks like such file
will be untouched by uninit.

Cheers,

Paolo