From d5af37ae22f0364be9ded773d737dd6e5b207b10 Mon Sep 17 00:00:00 2001 From: Ioana Ciornei Date: Thu, 21 Nov 2019 21:15:25 +0200 Subject: [PATCH 3/4] dpaa2-eth: do not hold rtnl_lock on phylink_create() or _destroy() The rtnl_lock should not be held when calling phylink_create() or phylink_destroy() since it leads to the deadlock listed below: [ 18.656576] rtnl_lock+0x18/0x20 [ 18.659798] sfp_bus_add_upstream+0x28/0x90 [ 18.663974] phylink_create+0x2cc/0x828 [ 18.667803] dpaa2_mac_connect+0x14c/0x2a8 [ 18.671890] dpaa2_eth_connect_mac+0x94/0xd8 Fix this by moving the _lock() and _unlock() calls just outside of phylink_of_phy_connect() and phylink_disconnect_phy(). Fixes: 719479230893 ("dpaa2-eth: add MAC/PHY support through phylink") Reported-by: Russell King Signed-off-by: Ioana Ciornei Signed-off-by: Russell King --- drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c | 4 ---- drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c | 4 ++++ 2 files changed, 4 insertions(+), 4 deletions(-) --- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c +++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c @@ -4215,12 +4215,10 @@ static irqreturn_t dpni_irq0_handler_thr dpaa2_eth_set_mac_addr(netdev_priv(net_dev)); dpaa2_eth_update_tx_fqids(priv); - rtnl_lock(); if (dpaa2_eth_has_mac(priv)) dpaa2_eth_disconnect_mac(priv); else dpaa2_eth_connect_mac(priv); - rtnl_unlock(); } return IRQ_HANDLED; @@ -4516,9 +4514,7 @@ static int dpaa2_eth_remove(struct fsl_m #endif unregister_netdev(net_dev); - rtnl_lock(); dpaa2_eth_disconnect_mac(priv); - rtnl_unlock(); dpaa2_eth_dl_port_del(priv); dpaa2_eth_dl_traps_unregister(priv); --- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c +++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c @@ -357,7 +357,9 @@ int dpaa2_mac_connect(struct dpaa2_mac * if (mac->pcs) phylink_set_pcs(mac->phylink, &mac->pcs->pcs); + rtnl_lock(); err = phylink_fwnode_phy_connect(mac->phylink, dpmac_node, 0); + rtnl_unlock(); if (err) { netdev_err(net_dev, "phylink_fwnode_phy_connect() = %d\n", err); goto err_phylink_destroy; @@ -378,7 +380,9 @@ void dpaa2_mac_disconnect(struct dpaa2_m if (!mac->phylink) return; + rtnl_lock(); phylink_disconnect_phy(mac->phylink); + rtnl_unlock(); phylink_destroy(mac->phylink); dpaa2_pcs_destroy(mac); }