Re: [PATCH net 03/10] net: ethernet: actions: Move setting of netops to fix crash
From: Maxime Chevallier
Date: Tue Oct 13 2026 - 16:10:14 EST
On 10/8/26 04:26, David Yang wrote:
> owl_emac_probe() calls owl_emac_phy_init(), which connects the PHY,
> before netdev->netdev_ops is assigned. phy_attach_direct() ->
> phy_link_topo_add_phy() reads dev->netdev_ops through
> netdev_need_ops_lock() since the commit in question, so probing crashes
> with a NULL pointer dereference when CONFIG_NET_SHAPER is enabled.
>
> Assign netdev_ops before the PHY attach, as was done for emac in commit
> 7c9f391ec89c ("net: emac: move setting of netops to fix crash").
>
> Fixes: ded86da4bbb7 ("net: ethtool: relax ethnl_req_get_phydev() locking assertion")
> Signed-off-by: David Yang <mmyangfl@xxxxxxxxx>
Reviewed-by: Maxime Chevallier <maxime.chevallier@xxxxxxxxxxx>
Thanks,
Maxime
> ---
> drivers/net/ethernet/actions/owl-emac.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/actions/owl-emac.c b/drivers/net/ethernet/actions/owl-emac.c
> index 0a08da799255..2538275a1e57 100644
> --- a/drivers/net/ethernet/actions/owl-emac.c
> +++ b/drivers/net/ethernet/actions/owl-emac.c
> @@ -1552,6 +1552,8 @@ static int owl_emac_probe(struct platform_device *pdev)
> return ret;
> }
>
> + netdev->netdev_ops = &owl_emac_netdev_ops;
> +
> ret = owl_emac_phy_init(netdev);
> if (ret) {
> dev_err(dev, "failed to initialize PHY\n");
> @@ -1563,7 +1565,6 @@ static int owl_emac_probe(struct platform_device *pdev)
> netdev->min_mtu = OWL_EMAC_MTU_MIN;
> netdev->max_mtu = OWL_EMAC_MTU_MAX;
> netdev->watchdog_timeo = OWL_EMAC_TX_TIMEOUT;
> - netdev->netdev_ops = &owl_emac_netdev_ops;
> netdev->ethtool_ops = &owl_emac_ethtool_ops;
> netif_napi_add(netdev, &priv->napi, owl_emac_poll);
>
text:
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Subject: Re: [PATCH net 03/10] net: ethernet: actions: Move setting of netops
to fix crash
To: David Yang <mmyangfl@xxxxxxxxx>, netdev@xxxxxxxxxxxxxxx
Cc: Andrew Lunn <andrew+netdev@xxxxxxx>, "David S. Miller"
<davem@xxxxxxxxxxxxx>, Eric Dumazet <edumazet@xxxxxxxxxx>,
Jakub Kicinski <kuba@xxxxxxxxxx>, Paolo Abeni <pabeni@xxxxxxxxxx>,
=?UTF-8?Q?Andreas_F=C3=A4rber?= <afaerber@xxxxxxx>,
Manivannan Sadhasivam <mani@xxxxxxxxxx>, Stanislav Fomichev
<sdf@xxxxxxxxxxx>, Nicolai Buchwitz <nb@xxxxxxxxxxx>,
Jacob Keller <jacob.e.keller@xxxxxxxxx>,
linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, linux-actions@xxxxxxxxxxxxxxxxxxx,
linux-kernel@xxxxxxxxxxxxxxx
References: <20261008022656.3592191-1-mmyangfl@xxxxxxxxx>
<20261008022656.3592191-4-mmyangfl@xxxxxxxxx>
Content-Language: en-US
From: Maxime Chevallier <maxime.chevallier@xxxxxxxxxxx>
In-Reply-To: <20261008022656.3592191-4-mmyangfl@xxxxxxxxx>
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X-Rspamd-Queue-Id: D872310333857
On 10/8/26 04:26, David Yang wrote:
> owl_emac_probe() calls owl_emac_phy_init(), which connects the PHY,
> before netdev->netdev_ops is assigned. phy_attach_direct() ->
> phy_link_topo_add_phy() reads dev->netdev_ops through
> netdev_need_ops_lock() since the commit in question, so probing crashes
> with a NULL pointer dereference when CONFIG_NET_SHAPER is enabled.
>
> Assign netdev_ops before the PHY attach, as was done for emac in commit
> 7c9f391ec89c ("net: emac: move setting of netops to fix crash").
>
> Fixes: ded86da4bbb7 ("net: ethtool: relax ethnl_req_get_phydev() locking assertion")
> Signed-off-by: David Yang <mmyangfl@xxxxxxxxx>
Reviewed-by: Maxime Chevallier <maxime.chevallier@xxxxxxxxxxx>
Thanks,
Maxime
> ---
> drivers/net/ethernet/actions/owl-emac.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/actions/owl-emac.c b/drivers/net/ethernet/actions/owl-emac.c
> index 0a08da799255..2538275a1e57 100644
> --- a/drivers/net/ethernet/actions/owl-emac.c
> +++ b/drivers/net/ethernet/actions/owl-emac.c
> @@ -1552,6 +1552,8 @@ static int owl_emac_probe(struct platform_device *pdev)
> return ret;
> }
>
> + netdev->netdev_ops = &owl_emac_netdev_ops;
> +
> ret = owl_emac_phy_init(netdev);
> if (ret) {
> dev_err(dev, "failed to initialize PHY\n");
> @@ -1563,7 +1565,6 @@ static int owl_emac_probe(struct platform_device *pdev)
> netdev->min_mtu = OWL_EMAC_MTU_MIN;
> netdev->max_mtu = OWL_EMAC_MTU_MAX;
> netdev->watchdog_timeo = OWL_EMAC_TX_TIMEOUT;
> - netdev->netdev_ops = &owl_emac_netdev_ops;
> netdev->ethtool_ops = &owl_emac_ethtool_ops;
> netif_napi_add(netdev, &priv->napi, owl_emac_poll);
>