netdev - Re: [PATCH net] net: socionext: netsec: always grab descriptor lock

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Message-Id: <20191001.090840.281037950909937158.davem@davemloft.net>
Date:   Tue, 01 Oct 2019 09:08:40 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     lorenzo@...nel.org
Cc:     netdev@...r.kernel.org, ilias.apalodimas@...aro.org,
        lorenzo.bianconi@...hat.com
Subject: Re: [PATCH net] net: socionext: netsec: always grab descriptor lock

From: Lorenzo Bianconi <lorenzo@...nel.org>
Date: Tue,  1 Oct 2019 10:33:51 +0200

> Always acquire tx descriptor spinlock even if a xdp program is not loaded
> on the netsec device since ndo_xdp_xmit can run concurrently with
> netsec_netdev_start_xmit and netsec_clean_tx_dring. This can happen
> loading a xdp program on a different device (e.g virtio-net) and
> xdp_do_redirect_map/xdp_do_redirect_slow can redirect to netsec even if
> we do not have a xdp program on it.
> 
> Fixes: ba2b232108d3 ("net: netsec: add XDP support")
> Tested-by: Ilias Apalodimas <ilias.apalodimas@...aro.org>
> Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>

Applied and queued up for v5.3 -stable.