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Date: Mon, 2 Nov 2020 18:38:54 +0100
From: Marcin Wojtas <mw@...ihalf.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, sashal@...nel.org
Cc: Antoine Tenart <antoine.tenart@...tlin.com>,
stable@...r.kernel.org, Russell King <rmk+kernel@...linux.org.uk>,
Alexandre Belloni <alexandre.belloni@...tlin.com>,
"David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
netdev <netdev@...r.kernel.org>,
Gabor Samu <samu_gabor@...oo.ca>,
Jon Nettleton <jon@...id-run.com>,
Andrew Elwell <andrew.elwell@...il.com>
Subject: Re: [PATCH net-next 2/4] net: mvpp2: add mvpp2_phylink_to_port() helper
Hi Greg and Sasha,
pt., 9 paź 2020 o 05:43 Marcin Wojtas <mw@...ihalf.com> napisał(a):
>
> Hi,
>
> sob., 20 cze 2020 o 11:21 Russell King <rmk+kernel@...linux.org.uk> napisał(a):
> >
> > Add a helper to convert the struct phylink_config pointer passed in
> > from phylink to the drivers internal struct mvpp2_port.
> >
> > Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>
> > ---
> > .../net/ethernet/marvell/mvpp2/mvpp2_main.c | 29 +++++++++----------
> > 1 file changed, 14 insertions(+), 15 deletions(-)
> >
> > diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
> > index 7653277d03b7..313f5a60a605 100644
> > --- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
> > +++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
> > @@ -4767,12 +4767,16 @@ static void mvpp2_port_copy_mac_addr(struct net_device *dev, struct mvpp2 *priv,
> > eth_hw_addr_random(dev);
> > }
> >
> > +static struct mvpp2_port *mvpp2_phylink_to_port(struct phylink_config *config)
> > +{
> > + return container_of(config, struct mvpp2_port, phylink_config);
> > +}
> > +
> > static void mvpp2_phylink_validate(struct phylink_config *config,
> > unsigned long *supported,
> > struct phylink_link_state *state)
> > {
> > - struct mvpp2_port *port = container_of(config, struct mvpp2_port,
> > - phylink_config);
> > + struct mvpp2_port *port = mvpp2_phylink_to_port(config);
> > __ETHTOOL_DECLARE_LINK_MODE_MASK(mask) = { 0, };
> >
> > /* Invalid combinations */
> > @@ -4913,8 +4917,7 @@ static void mvpp2_gmac_pcs_get_state(struct mvpp2_port *port,
> > static void mvpp2_phylink_mac_pcs_get_state(struct phylink_config *config,
> > struct phylink_link_state *state)
> > {
> > - struct mvpp2_port *port = container_of(config, struct mvpp2_port,
> > - phylink_config);
> > + struct mvpp2_port *port = mvpp2_phylink_to_port(config);
> >
> > if (port->priv->hw_version == MVPP22 && port->gop_id == 0) {
> > u32 mode = readl(port->base + MVPP22_XLG_CTRL3_REG);
> > @@ -4931,8 +4934,7 @@ static void mvpp2_phylink_mac_pcs_get_state(struct phylink_config *config,
> >
> > static void mvpp2_mac_an_restart(struct phylink_config *config)
> > {
> > - struct mvpp2_port *port = container_of(config, struct mvpp2_port,
> > - phylink_config);
> > + struct mvpp2_port *port = mvpp2_phylink_to_port(config);
> > u32 val = readl(port->base + MVPP2_GMAC_AUTONEG_CONFIG);
> >
> > writel(val | MVPP2_GMAC_IN_BAND_RESTART_AN,
> > @@ -5105,13 +5107,12 @@ static void mvpp2_gmac_config(struct mvpp2_port *port, unsigned int mode,
> > static void mvpp2_mac_config(struct phylink_config *config, unsigned int mode,
> > const struct phylink_link_state *state)
> > {
> > - struct net_device *dev = to_net_dev(config->dev);
> > - struct mvpp2_port *port = netdev_priv(dev);
> > + struct mvpp2_port *port = mvpp2_phylink_to_port(config);
> > bool change_interface = port->phy_interface != state->interface;
> >
> > /* Check for invalid configuration */
> > if (mvpp2_is_xlg(state->interface) && port->gop_id != 0) {
> > - netdev_err(dev, "Invalid mode on %s\n", dev->name);
> > + netdev_err(port->dev, "Invalid mode on %s\n", port->dev->name);
> > return;
> > }
> >
> > @@ -5151,8 +5152,7 @@ static void mvpp2_mac_link_up(struct phylink_config *config,
> > int speed, int duplex,
> > bool tx_pause, bool rx_pause)
> > {
> > - struct net_device *dev = to_net_dev(config->dev);
> > - struct mvpp2_port *port = netdev_priv(dev);
> > + struct mvpp2_port *port = mvpp2_phylink_to_port(config);
> > u32 val;
> >
> > if (mvpp2_is_xlg(interface)) {
> > @@ -5199,14 +5199,13 @@ static void mvpp2_mac_link_up(struct phylink_config *config,
> >
> > mvpp2_egress_enable(port);
> > mvpp2_ingress_enable(port);
> > - netif_tx_wake_all_queues(dev);
> > + netif_tx_wake_all_queues(port->dev);
> > }
> >
> > static void mvpp2_mac_link_down(struct phylink_config *config,
> > unsigned int mode, phy_interface_t interface)
> > {
> > - struct net_device *dev = to_net_dev(config->dev);
> > - struct mvpp2_port *port = netdev_priv(dev);
> > + struct mvpp2_port *port = mvpp2_phylink_to_port(config);
> > u32 val;
> >
> > if (!phylink_autoneg_inband(mode)) {
> > @@ -5223,7 +5222,7 @@ static void mvpp2_mac_link_down(struct phylink_config *config,
> > }
> > }
> >
> > - netif_tx_stop_all_queues(dev);
> > + netif_tx_stop_all_queues(port->dev);
> > mvpp2_egress_disable(port);
> > mvpp2_ingress_disable(port);
> >
> > --
> > 2.20.1
> >
>
> This patch fixes a regression that was introduced in v5.3:
> Commit 44cc27e43fa3 ("net: phylink: Add struct phylink_config to PHYLINK API")
>
> Above results in a NULL pointer dereference when booting the
> Armada7k8k/CN913x with ACPI between 5.3 and 5.8, which will be
> problematic especially for the distros using LTSv5.4 and above (the
> issue was reported on Fedora 32).
>
> Please help with backporting to the stable v5.3+ branches (it applies
> smoothly on v5.4/v5.6/v5.8).
>
Any chances to backport this patch to relevant v5.3+ stable branches?
Best regards,
Marcin
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