From: Jiping Ma jiping.ma2@windriver.com

commit 481a7d154cbbd5ca355cc01cc8969876b240eded upstream.

Add one notifier for udev changes net device name.

Fixes: 466c5ac8bdf2 ("net: stmmac: create one debugfs dir per net-device") Signed-off-by: Jiping Ma jiping.ma2@windriver.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Gou Hao gouhao@uniontech.com --- .../net/ethernet/stmicro/stmmac/stmmac_main.c | 32 +++++++++++++++++++ 1 file changed, 32 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c index 0a4d093adfc9..3e35cdf0d2b7 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c @@ -114,6 +114,7 @@ MODULE_PARM_DESC(chain_mode, "To use chain instead of ring mode"); static irqreturn_t stmmac_interrupt(int irq, void *dev_id);

#ifdef CONFIG_DEBUG_FS +static const struct net_device_ops stmmac_netdev_ops; static int stmmac_init_fs(struct net_device *dev); static void stmmac_exit_fs(struct net_device *dev); #endif @@ -4034,6 +4035,34 @@ static const struct file_operations stmmac_dma_cap_fops = { .release = single_release, };

+/* Use network device events to rename debugfs file entries. + */ +static int stmmac_device_event(struct notifier_block *unused, + unsigned long event, void *ptr) +{ + struct net_device *dev = netdev_notifier_info_to_dev(ptr); + struct stmmac_priv *priv = netdev_priv(dev); + + if (dev->netdev_ops != &stmmac_netdev_ops) + goto done; + + switch (event) { + case NETDEV_CHANGENAME: + if (priv->dbgfs_dir) + priv->dbgfs_dir = debugfs_rename(stmmac_fs_dir, + priv->dbgfs_dir, + stmmac_fs_dir, + dev->name); + break; + } +done: + return NOTIFY_DONE; +} + +static struct notifier_block stmmac_notifier = { + .notifier_call = stmmac_device_event, +}; + static int stmmac_init_fs(struct net_device *dev) { struct stmmac_priv *priv = netdev_priv(dev); @@ -4072,6 +4101,8 @@ static int stmmac_init_fs(struct net_device *dev) return -ENOMEM; }

+ register_netdevice_notifier(&stmmac_notifier); + return 0; }

@@ -4079,6 +4110,7 @@ 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 */