From: Breno Leitao <leitao@debian.org>
To: Qingfang Deng <qingfang.deng@linux.dev>
Cc: 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>,
Norbert Szetei <norbert@doyensec.com>,
Taegu Ha <hataegu0826@gmail.com>,
linux-ppp@vger.kernel.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH net] ppp: annotate lockless queue empty check
Date: Tue, 11 Aug 2026 02:41:17 -0700 [thread overview]
Message-ID: <anrt_vOzR6rNQdXp@gmail.com> (raw)
In-Reply-To: <20260811060236.322284-1-qingfang.deng@linux.dev>
On Tue, Aug 11, 2026 at 02:02:29PM +0800, Qingfang Deng wrote:
> ppp_poll() checks whether pf->rq contains a packet without holding the
> queue lock. skb_peek() requires appropriate locking or a private queue,
> neither of which applies because ppp_input() can enqueue concurrently.
>
> Only queue emptiness is needed, so use skb_queue_empty_lockless()
> instead.
>
> Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
> Signed-off-by: Qingfang Deng <qingfang.deng@linux.dev>
Reviewed-by: Breno Leitao <leitao@debian.org.
prev parent reply other threads:[~2026-08-11 9:41 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-11 6:02 [PATCH net] ppp: annotate lockless queue empty check Qingfang Deng
2026-08-11 9:41 ` Breno Leitao [this message]
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