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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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Merge branch 'ravb-sh_eth-fix-sleep-in-atomic-by-reusing-shared-ethtool-handlers'
Vladimir Zapolskiy says: ==================== ravb/sh_eth: fix sleep in atomic by reusing shared ethtool handlers For ages trivial changes to RAVB and SuperH ethernet links by means of standard 'ethtool' trigger a 'sleeping function called from invalid context' bug, to visualize it on r8a7795 ULCB: % ethtool -r eth0 BUG: sleeping function called from invalid context at kernel/locking/mutex.c:747 in_atomic(): 1, irqs_disabled(): 128, pid: 554, name: ethtool INFO: lockdep is turned off. irq event stamp: 0 hardirqs last enabled at (0): [<0000000000000000>] (null) hardirqs last disabled at (0): [<ffff0000080e1d3c>] copy_process.isra.7.part.8+0x2cc/0x1918 softirqs last enabled at (0): [<ffff0000080e1d3c>] copy_process.isra.7.part.8+0x2cc/0x1918 softirqs last disabled at (0): [<0000000000000000>] (null) CPU: 5 PID: 554 Comm: ethtool Not tainted 4.17.0-rc4-arm64-renesas+ #33 Hardware name: Renesas H3ULCB board based on r8a7795 ES2.0+ (DT) Call trace: dump_backtrace+0x0/0x198 show_stack+0x24/0x30 dump_stack+0xb8/0xf4 ___might_sleep+0x1c8/0x1f8 __might_sleep+0x58/0x90 __mutex_lock+0x50/0x890 mutex_lock_nested+0x3c/0x50 phy_start_aneg_priv+0x38/0x180 phy_start_aneg+0x24/0x30 ravb_nway_reset+0x3c/0x68 dev_ethtool+0x3dc/0x2338 dev_ioctl+0x19c/0x490 sock_do_ioctl+0xe0/0x238 sock_ioctl+0x254/0x460 do_vfs_ioctl+0xb0/0x918 ksys_ioctl+0x50/0x80 sys_ioctl+0x34/0x48 __sys_trace_return+0x0/0x4 The root cause is that an attempt to modify ECMR and GECMR registers only when RX/TX function is disabled was too overcomplicated in its original implementation, also processing of an optional Link Change interrupt added even more complexity, as a result the implementation was error prone. The new locking scheme is confirmed to be correct by dumping driver specific and generic PHY framework function calls with aid of ftrace while running more or less advanced tests. Please note that sh_eth patches from the series were built-tested only. On purpose I do not add Fixes tags, the reused PHY handlers were added way later than the fixed problems were firstly found in the drivers. Changes from v1 to v2: * the original patches are split to bugfixes and enhancements only, both v1 and v2 series are absolutely equal in total, thus I omit description of changes in individual patches, * the latter implies that there should be no strict need for retesting, but because formally two series are different, I have to drop the tags given by Geert and Andrew, please send your tags again. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
commit
0f62aeec0f
@ -980,6 +980,13 @@ static void ravb_adjust_link(struct net_device *ndev)
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struct ravb_private *priv = netdev_priv(ndev);
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struct phy_device *phydev = ndev->phydev;
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bool new_state = false;
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unsigned long flags;
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spin_lock_irqsave(&priv->lock, flags);
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/* Disable TX and RX right over here, if E-MAC change is ignored */
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if (priv->no_avb_link)
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ravb_rcv_snd_disable(ndev);
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if (phydev->link) {
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if (phydev->duplex != priv->duplex) {
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@ -997,18 +1004,21 @@ static void ravb_adjust_link(struct net_device *ndev)
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ravb_modify(ndev, ECMR, ECMR_TXF, 0);
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new_state = true;
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priv->link = phydev->link;
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if (priv->no_avb_link)
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ravb_rcv_snd_enable(ndev);
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}
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} else if (priv->link) {
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new_state = true;
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priv->link = 0;
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priv->speed = 0;
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priv->duplex = -1;
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if (priv->no_avb_link)
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ravb_rcv_snd_disable(ndev);
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}
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/* Enable TX and RX right over here, if E-MAC change is ignored */
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if (priv->no_avb_link && phydev->link)
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ravb_rcv_snd_enable(ndev);
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mmiowb();
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spin_unlock_irqrestore(&priv->lock, flags);
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if (new_state && netif_msg_link(priv))
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phy_print_status(phydev);
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}
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@ -1096,75 +1106,6 @@ static int ravb_phy_start(struct net_device *ndev)
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return 0;
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}
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static int ravb_get_link_ksettings(struct net_device *ndev,
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struct ethtool_link_ksettings *cmd)
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{
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struct ravb_private *priv = netdev_priv(ndev);
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unsigned long flags;
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if (!ndev->phydev)
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return -ENODEV;
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spin_lock_irqsave(&priv->lock, flags);
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phy_ethtool_ksettings_get(ndev->phydev, cmd);
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spin_unlock_irqrestore(&priv->lock, flags);
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return 0;
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}
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static int ravb_set_link_ksettings(struct net_device *ndev,
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const struct ethtool_link_ksettings *cmd)
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{
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struct ravb_private *priv = netdev_priv(ndev);
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unsigned long flags;
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int error;
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if (!ndev->phydev)
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return -ENODEV;
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spin_lock_irqsave(&priv->lock, flags);
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/* Disable TX and RX */
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ravb_rcv_snd_disable(ndev);
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error = phy_ethtool_ksettings_set(ndev->phydev, cmd);
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if (error)
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goto error_exit;
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if (cmd->base.duplex == DUPLEX_FULL)
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priv->duplex = 1;
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else
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priv->duplex = 0;
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ravb_set_duplex(ndev);
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error_exit:
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mdelay(1);
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/* Enable TX and RX */
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ravb_rcv_snd_enable(ndev);
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mmiowb();
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spin_unlock_irqrestore(&priv->lock, flags);
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return error;
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}
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static int ravb_nway_reset(struct net_device *ndev)
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{
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struct ravb_private *priv = netdev_priv(ndev);
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int error = -ENODEV;
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unsigned long flags;
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if (ndev->phydev) {
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spin_lock_irqsave(&priv->lock, flags);
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error = phy_start_aneg(ndev->phydev);
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spin_unlock_irqrestore(&priv->lock, flags);
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}
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return error;
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}
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static u32 ravb_get_msglevel(struct net_device *ndev)
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{
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struct ravb_private *priv = netdev_priv(ndev);
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@ -1377,7 +1318,7 @@ static int ravb_set_wol(struct net_device *ndev, struct ethtool_wolinfo *wol)
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}
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static const struct ethtool_ops ravb_ethtool_ops = {
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.nway_reset = ravb_nway_reset,
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.nway_reset = phy_ethtool_nway_reset,
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.get_msglevel = ravb_get_msglevel,
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.set_msglevel = ravb_set_msglevel,
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.get_link = ethtool_op_get_link,
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@ -1387,8 +1328,8 @@ static const struct ethtool_ops ravb_ethtool_ops = {
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.get_ringparam = ravb_get_ringparam,
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.set_ringparam = ravb_set_ringparam,
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.get_ts_info = ravb_get_ts_info,
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.get_link_ksettings = ravb_get_link_ksettings,
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.set_link_ksettings = ravb_set_link_ksettings,
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.get_link_ksettings = phy_ethtool_get_link_ksettings,
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.set_link_ksettings = phy_ethtool_set_link_ksettings,
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.get_wol = ravb_get_wol,
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.set_wol = ravb_set_wol,
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};
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@ -1927,8 +1927,15 @@ static void sh_eth_adjust_link(struct net_device *ndev)
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{
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struct sh_eth_private *mdp = netdev_priv(ndev);
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struct phy_device *phydev = ndev->phydev;
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unsigned long flags;
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int new_state = 0;
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spin_lock_irqsave(&mdp->lock, flags);
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/* Disable TX and RX right over here, if E-MAC change is ignored */
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if (mdp->cd->no_psr || mdp->no_ether_link)
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sh_eth_rcv_snd_disable(ndev);
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if (phydev->link) {
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if (phydev->duplex != mdp->duplex) {
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new_state = 1;
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@ -1947,18 +1954,21 @@ static void sh_eth_adjust_link(struct net_device *ndev)
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sh_eth_modify(ndev, ECMR, ECMR_TXF, 0);
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new_state = 1;
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mdp->link = phydev->link;
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if (mdp->cd->no_psr || mdp->no_ether_link)
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sh_eth_rcv_snd_enable(ndev);
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}
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} else if (mdp->link) {
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new_state = 1;
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mdp->link = 0;
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mdp->speed = 0;
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mdp->duplex = -1;
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if (mdp->cd->no_psr || mdp->no_ether_link)
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sh_eth_rcv_snd_disable(ndev);
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}
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/* Enable TX and RX right over here, if E-MAC change is ignored */
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if ((mdp->cd->no_psr || mdp->no_ether_link) && phydev->link)
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sh_eth_rcv_snd_enable(ndev);
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mmiowb();
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spin_unlock_irqrestore(&mdp->lock, flags);
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if (new_state && netif_msg_link(mdp))
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phy_print_status(phydev);
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}
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@ -2030,60 +2040,6 @@ static int sh_eth_phy_start(struct net_device *ndev)
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return 0;
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}
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static int sh_eth_get_link_ksettings(struct net_device *ndev,
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struct ethtool_link_ksettings *cmd)
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{
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struct sh_eth_private *mdp = netdev_priv(ndev);
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unsigned long flags;
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if (!ndev->phydev)
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return -ENODEV;
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spin_lock_irqsave(&mdp->lock, flags);
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phy_ethtool_ksettings_get(ndev->phydev, cmd);
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spin_unlock_irqrestore(&mdp->lock, flags);
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return 0;
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}
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static int sh_eth_set_link_ksettings(struct net_device *ndev,
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const struct ethtool_link_ksettings *cmd)
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{
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struct sh_eth_private *mdp = netdev_priv(ndev);
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unsigned long flags;
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int ret;
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if (!ndev->phydev)
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return -ENODEV;
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spin_lock_irqsave(&mdp->lock, flags);
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/* disable tx and rx */
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sh_eth_rcv_snd_disable(ndev);
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ret = phy_ethtool_ksettings_set(ndev->phydev, cmd);
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if (ret)
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goto error_exit;
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if (cmd->base.duplex == DUPLEX_FULL)
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mdp->duplex = 1;
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else
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mdp->duplex = 0;
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if (mdp->cd->set_duplex)
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mdp->cd->set_duplex(ndev);
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error_exit:
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mdelay(1);
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/* enable tx and rx */
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sh_eth_rcv_snd_enable(ndev);
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spin_unlock_irqrestore(&mdp->lock, flags);
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return ret;
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}
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/* If it is ever necessary to increase SH_ETH_REG_DUMP_MAX_REGS, the
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* version must be bumped as well. Just adding registers up to that
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* limit is fine, as long as the existing register indices don't
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@ -2263,22 +2219,6 @@ static void sh_eth_get_regs(struct net_device *ndev, struct ethtool_regs *regs,
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pm_runtime_put_sync(&mdp->pdev->dev);
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}
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static int sh_eth_nway_reset(struct net_device *ndev)
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{
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struct sh_eth_private *mdp = netdev_priv(ndev);
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unsigned long flags;
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int ret;
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if (!ndev->phydev)
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return -ENODEV;
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spin_lock_irqsave(&mdp->lock, flags);
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ret = phy_start_aneg(ndev->phydev);
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spin_unlock_irqrestore(&mdp->lock, flags);
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return ret;
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}
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static u32 sh_eth_get_msglevel(struct net_device *ndev)
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{
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struct sh_eth_private *mdp = netdev_priv(ndev);
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@ -2429,7 +2369,7 @@ static int sh_eth_set_wol(struct net_device *ndev, struct ethtool_wolinfo *wol)
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static const struct ethtool_ops sh_eth_ethtool_ops = {
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.get_regs_len = sh_eth_get_regs_len,
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.get_regs = sh_eth_get_regs,
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.nway_reset = sh_eth_nway_reset,
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.nway_reset = phy_ethtool_nway_reset,
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.get_msglevel = sh_eth_get_msglevel,
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.set_msglevel = sh_eth_set_msglevel,
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.get_link = ethtool_op_get_link,
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@ -2438,8 +2378,8 @@ static const struct ethtool_ops sh_eth_ethtool_ops = {
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.get_sset_count = sh_eth_get_sset_count,
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.get_ringparam = sh_eth_get_ringparam,
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.set_ringparam = sh_eth_set_ringparam,
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.get_link_ksettings = sh_eth_get_link_ksettings,
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.set_link_ksettings = sh_eth_set_link_ksettings,
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.get_link_ksettings = phy_ethtool_get_link_ksettings,
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.set_link_ksettings = phy_ethtool_set_link_ksettings,
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.get_wol = sh_eth_get_wol,
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.set_wol = sh_eth_set_wol,
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};
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