From: Breno Leitao <leitao@debian.org>
To: Qingfang Deng <dqfext@gmail.com>
Cc: linux-ppp@vger.kernel.org, Andrew Lunn <andrew+netdev@lunn.ch>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>,
Paolo Abeni <pabeni@redhat.com>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
James Chapman <jchapman@katalix.com>
Subject: Re: [PATCH net-next] ppp: require callers of ppp_dev_name() to hold RCU
Date: Tue, 17 Mar 2026 13:05:23 -0700 [thread overview]
Message-ID: <abmyig2dVODQYTnX@gmail.com> (raw)
In-Reply-To: <20260316092824.479149-1-dqfext@gmail.com>
On Mon, Mar 16, 2026 at 05:28:23PM +0800, Qingfang Deng wrote:
> ppp_dev_name() holds the RCU read lock internally to protect pch->ppp.
> However, as it returns netdev->name to the caller, the caller should
> also hold either RCU or RTNL lock to prevent the netdev from being
> freed.
>
> The only two references of the function is in the L2TP driver, both of
nit: The only two references of the function *are*...
> which already hold RCU. So remove the internal RCU lock and document
> that callers must hold RCU.
This symbol is also exported, but, we don't care if external drivers
call it without holding the RCU read lock.
> Signed-off-by: Qingfang Deng <dqfext@gmail.com>
Reviewed-by: Breno Leitao <leitao@debian.org>
next prev parent reply other threads:[~2026-03-17 20:05 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-16 9:28 [PATCH net-next] ppp: require callers of ppp_dev_name() to hold RCU Qingfang Deng
2026-03-17 20:05 ` Breno Leitao [this message]
2026-03-17 23:30 ` patchwork-bot+netdevbpf
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