netdev - Re: [PATCH 4.19-stable 1/3] tcp: annotate tp->copied

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Date:   Fri, 12 Mar 2021 10:51:25 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>, stable@...r.kernel.org
Subject: Re: [PATCH 4.19-stable 1/3] tcp: annotate tp->copied_seq lockless
 reads

On Fri, Mar 12, 2021 at 12:33:21AM -0800, Eric Dumazet wrote:
> From: Eric Dumazet <edumazet@...gle.com>
> 
> [ Upstream commit 7db48e983930285b765743ebd665aecf9850582b ]
> 
> There are few places where we fetch tp->copied_seq while
> this field can change from IRQ or other cpu.
> 
> We need to add READ_ONCE() annotations, and also make
> sure write sides use corresponding WRITE_ONCE() to avoid
> store-tearing.
> 
> Note that tcp_inq_hint() was already using READ_ONCE(tp->copied_seq)
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Signed-off-by: David S. Miller <davem@...emloft.net>

All now queued up, thanks!

greg k-h