netdev - Re: [PATCH] stmmac: debugfs entry name is not be changed when udev rename device name.

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Message-ID: <57dcdaa1-feff-1134-919e-57b37e306431@cogentembedded.com>
Date:   Tue, 31 Dec 2019 13:12:29 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:     Jiping Ma <jiping.ma2@...driver.com>, peppe.cavallaro@...com,
        alexandre.torgue@...com
Cc:     joabreu@...opsys.com, mcoquelin.stm32@...il.com,
        netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] stmmac: debugfs entry name is not be changed when udev
 rename device name.

Hello!

On 31.12.2019 5:03, Jiping Ma wrote:

> Add one notifier for udev changes net device name.
> 
> Signed-off-by: Jiping Ma <jiping.ma2@...driver.com>
> ---
>   .../net/ethernet/stmicro/stmmac/stmmac_main.c | 38 ++++++++++++++++++-
>   1 file changed, 37 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> index b14f46a57154..c1c877bb4421 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> @@ -4038,6 +4038,40 @@ static int stmmac_dma_cap_show(struct seq_file *seq, void *v)
>   }
>   DEFINE_SHOW_ATTRIBUTE(stmmac_dma_cap);
>   
> +/**
> + * Use network device events to create/remove/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);
> +
> +	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;
> +
> +	case NETDEV_GOING_DOWN:
> +		break;
> +
> +	case NETDEV_UP:
> +		break;

    Why not merge the above 2 cases? Or just remove them('event' is not *enum*)?

> +	}
> +
> +done:
> +	return NOTIFY_DONE;
> +}
[...]

MBR, Sergei