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Date:   Tue, 3 Dec 2019 11:15:31 -0800
From:   Eric Dumazet <>
To:     Greg Kroah-Hartman <>
Cc:     "David S . Miller" <>,
        netdev <>,
        Eric Dumazet <>,
        Soheil Hassas Yeganeh <>,
        Neal Cardwell <>,
        Yuchung Cheng <>,
        Willem de Bruijn <>
Subject: Re: [PATCH net] tcp: refactor tcp_retransmit_timer()

On Tue, Dec 3, 2019 at 11:13 AM Greg Kroah-Hartman
<> wrote:
> On Tue, Dec 03, 2019 at 08:05:52AM -0800, Eric Dumazet wrote:
> > It appears linux-4.14 stable needs a backport of commit
> > 88f8598d0a30 ("tcp: exit if nothing to retransmit on RTO timeout")
> >
> > Since tcp_rtx_queue_empty() is not in pre 4.15 kernels,
> > let's refactor tcp_retransmit_timer() to only use tcp_rtx_queue_head()
> So does that mean that 4.19.y should get 88f8598d0a30 ("tcp: exit if
> nothing to retransmit on RTO timeout") as-is?

Yes indeed. All stable versions need it.

> > I will provide to stable teams the squashed patches.
> This is that squashed patch, right?

Yes, both patches squashed to avoid breaking future bisections.

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