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