diff options
author | Ioana Ciornei <ioana.ciornei@nxp.com> | 2019-11-21 21:15:25 +0200 |
---|---|---|
committer | Russell King (Oracle) <rmk+kernel@armlinux.org.uk> | 2022-01-18 10:19:15 +0000 |
commit | 265468cb45080b29562b5db661112fecaa4588da (patch) | |
tree | 7bc06902150a2b3092cdf3dd37e71fa4d00985b8 | |
parent | 870d60b7f6fd94bb726e8a14345fa6ade3c98613 (diff) |
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 <linux@armlinux.org.uk>
Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
-rw-r--r-- | drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c | 4 | ||||
-rw-r--r-- | drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c | 4 |
2 files changed, 4 insertions, 4 deletions
diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c index 8e643567abce..f1b4c714303e 100644 --- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c +++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c @@ -4223,12 +4223,10 @@ static irqreturn_t dpni_irq0_handler_thread(int irq_num, void *arg) 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; @@ -4523,9 +4521,7 @@ static int dpaa2_eth_remove(struct fsl_mc_device *ls_dev) #ifdef CONFIG_DEBUG_FS dpaa2_dbg_remove(priv); #endif - rtnl_lock(); dpaa2_eth_disconnect_mac(priv); - rtnl_unlock(); unregister_netdev(net_dev); diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c b/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c index b5fc78c07d73..3964e626dec4 100644 --- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c +++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c @@ -311,7 +311,9 @@ int dpaa2_mac_connect(struct dpaa2_mac *mac) } mac->phylink = phylink; + 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; @@ -332,7 +334,9 @@ void dpaa2_mac_disconnect(struct dpaa2_mac *mac) if (!mac->phylink) return; + rtnl_lock(); phylink_disconnect_phy(mac->phylink); + rtnl_unlock(); phylink_destroy(mac->phylink); dpaa2_pcs_destroy(mac); } |