Commit 474a31e1 authored by Aaro Koskinen's avatar Aaro Koskinen Committed by David S. Miller
Browse files

net: stmmac: fix notifier registration 



We cannot register the same netdev notifier multiple times when probing
stmmac devices. Register the notifier only once in module init, and also
make debugfs creation/deletion safe against simultaneous notifier call.

Fixes: 481a7d15 ("stmmac: debugfs entry name is not be changed when udev rename device name.")
Signed-off-by: default avatarAaro Koskinen <aaro.koskinen@nokia.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent c87a9d6f

drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

+8 −5
Original line number Diff line number Diff line
@@ -4405,6 +4405,8 @@ static void stmmac_init_fs(struct net_device *dev) 
{

	struct stmmac_priv *priv = netdev_priv(dev);



	rtnl_lock();



	/* Create per netdev entries */

	priv->dbgfs_dir = debugfs_create_dir(dev->name, stmmac_fs_dir);
@@ -4416,14 +4418,13 @@ static void stmmac_init_fs(struct net_device *dev) 
	debugfs_create_file("dma_cap", 0444, priv->dbgfs_dir, dev,

			    &stmmac_dma_cap_fops);



	register_netdevice_notifier(&stmmac_notifier);

	rtnl_unlock();

}



static void stmmac_exit_fs(struct net_device *dev)

{

	struct stmmac_priv *priv = netdev_priv(dev);



	unregister_netdevice_notifier(&stmmac_notifier);

	debugfs_remove_recursive(priv->dbgfs_dir);

}

#endif /* CONFIG_DEBUG_FS */
@@ -4940,14 +4941,14 @@ int stmmac_dvr_remove(struct device *dev) 


	netdev_info(priv->dev, "%s: removing driver", __func__);



#ifdef CONFIG_DEBUG_FS

	stmmac_exit_fs(ndev);

#endif

	stmmac_stop_all_dma(priv);



	stmmac_mac_set(priv, priv->ioaddr, false);

	netif_carrier_off(ndev);

	unregister_netdev(ndev);

#ifdef CONFIG_DEBUG_FS

	stmmac_exit_fs(ndev);

#endif

	phylink_destroy(priv->phylink);

	if (priv->plat->stmmac_rst)

		reset_control_assert(priv->plat->stmmac_rst);
@@ -5166,6 +5167,7 @@ static int __init stmmac_init(void) 
	/* Create debugfs main directory if it doesn't exist yet */

	if (!stmmac_fs_dir)

		stmmac_fs_dir = debugfs_create_dir(STMMAC_RESOURCE_NAME, NULL);

	register_netdevice_notifier(&stmmac_notifier);

#endif



	return 0;
@@ -5174,6 +5176,7 @@ static int __init stmmac_init(void) 
static void __exit stmmac_exit(void)

{

#ifdef CONFIG_DEBUG_FS

	unregister_netdevice_notifier(&stmmac_notifier);

	debugfs_remove_recursive(stmmac_fs_dir);

#endif

}

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