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net: stmmac: Move debugfs init/exit to ->probe()/->remove()

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Setting up and tearing down debugfs is current unbalanced, as seen by
this error during resume from suspend:

    [  752.134067] dwc-eth-dwmac 2490000.ethernet eth0: ERROR failed to create debugfs directory
    [  752.134347] dwc-eth-dwmac 2490000.ethernet eth0: stmmac_hw_setup: failed debugFS registration

The imbalance happens because the driver creates the debugfs hierarchy
when the device is opened and tears it down when the device is closed.
There's little gain in that, and it could be argued that it is even
surprising because it's not usually done for other devices. Fix the
imbalance by moving the debugfs creation and teardown to the driver's
->probe() and ->remove() implementations instead.

Note that the ring descriptors cannot be read while the interface is
down, so make sure to return an empty file when the descriptors_status
debugfs file is read.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Acked-by: Jose Abreu <joabreu@synopsys.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thierry Reding 2018-11-27 14:21:43 +01:00 committed by David S. Miller
parent 4135cce7fd
commit 5f2b8b6278
1 changed files with 13 additions and 10 deletions
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23
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
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@ -2550,12 +2550,6 @@ static int stmmac_hw_setup(struct net_device *dev, bool init_ptp)
netdev_warn(priv->dev, "PTP init failed\n");
}
#ifdef CONFIG_DEBUG_FS
ret = stmmac_init_fs(dev);
if (ret < 0)
netdev_warn(priv->dev, "%s: failed debugFS registration\n",
__func__);
#endif
priv->tx_lpi_timer = STMMAC_DEFAULT_TWT_LS;
if (priv->use_riwt) {
@ -2756,10 +2750,6 @@ static int stmmac_release(struct net_device *dev)
netif_carrier_off(dev);
#ifdef CONFIG_DEBUG_FS
stmmac_exit_fs(dev);
#endif
stmmac_release_ptp(priv);
return 0;
@ -3899,6 +3889,9 @@ static int stmmac_sysfs_ring_read(struct seq_file *seq, void *v)
u32 tx_count = priv->plat->tx_queues_to_use;
u32 queue;
if ((dev->flags & IFF_UP) == 0)
return 0;
for (queue = 0; queue < rx_count; queue++) {
struct stmmac_rx_queue *rx_q = &priv->rx_queue[queue];
@ -4397,6 +4390,13 @@ int stmmac_dvr_probe(struct device *device,
goto error_netdev_register;
}
#ifdef CONFIG_DEBUG_FS
ret = stmmac_init_fs(ndev);
if (ret < 0)
netdev_warn(priv->dev, "%s: failed debugFS registration\n",
__func__);
#endif
return ret;
error_netdev_register:
@ -4432,6 +4432,9 @@ 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);