linux-kernel - Re: [PATCH] mediatek/mt7601u: add debugfs exit function

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Date:   Fri, 22 Apr 2022 05:49:19 -0700
From:   Jakub Kicinski <kubakici@...pl>
To:     Kalle Valo <kvalo@...nel.org>
Cc:     Bernard Zhao <zhaojunkui2008@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Paolo Abeni <pabeni@...hat.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        bernard@...o.com
Subject: Re: [PATCH] mediatek/mt7601u: add debugfs exit function

On Fri, 22 Apr 2022 10:45:57 +0300 Kalle Valo wrote:
> > When mt7601u loaded, there are two cases:
> > First when mt7601u is loaded, in function mt7601u_probe, if
> > function mt7601u_probe run into error lable err_hw,
> > mt7601u_cleanup didn`t cleanup the debugfs node.
> > Second when the module disconnect, in function mt7601u_disconnect,
> > mt7601u_cleanup didn`t cleanup the debugfs node.
> > This patch add debugfs exit function and try to cleanup debugfs
> > node when mt7601u loaded fail or unloaded.

Is this actually needed?  Looks like wireless has a wiphy debugfs dir
now, so the entire thing should get removed recursively when probe
fails. The driver is not doing anything special.

> > diff --git a/drivers/net/wireless/mediatek/mt7601u/debugfs.c b/drivers/net/wireless/mediatek/mt7601u/debugfs.c
> > index 20669eacb66e..1ae3d75d3c9b 100644
> > --- a/drivers/net/wireless/mediatek/mt7601u/debugfs.c
> > +++ b/drivers/net/wireless/mediatek/mt7601u/debugfs.c
> > @@ -124,17 +124,22 @@ DEFINE_SHOW_ATTRIBUTE(mt7601u_eeprom_param);
> >  
> >  void mt7601u_init_debugfs(struct mt7601u_dev *dev)
> >  {
> > -	struct dentry *dir;
> > -
> > -	dir = debugfs_create_dir("mt7601u", dev->hw->wiphy->debugfsdir);
> > -	if (!dir)
> > +	dev->root_dir = debugfs_create_dir("mt7601u", dev->hw->wiphy->debugfsdir);
> > +	if (!dev->root_dir)
> >  		return;