netdev - Re: [PATCH v2] net: hso: do not call unregister if not registered

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Message-ID: <20201004071433.GA212114@kroah.com>
Date:   Sun, 4 Oct 2020 09:14:33 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     David Miller <davem@...emloft.net>, tuba@....ufl.edu
Cc:     netdev@...r.kernel.org, kuba@...nel.org, oneukum@...e.com,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH v2] net: hso: do not call unregister if not registered

On Sat, Oct 03, 2020 at 05:00:42PM -0700, David Miller wrote:
> From: Greg KH <gregkh@...uxfoundation.org>
> Date: Fri, 2 Oct 2020 13:43:23 +0200
> 
> > @@ -2366,7 +2366,8 @@ static void hso_free_net_device(struct hso_device *hso_dev, bool bailout)
> >  
> >  	remove_net_device(hso_net->parent);
> >  
> > -	if (hso_net->net)
> > +	if (hso_net->net &&
> > +	    hso_net->net->reg_state == NETREG_REGISTERED)
> >  		unregister_netdev(hso_net->net);
> >  
> >  	/* start freeing */
> 
> I really want to get out of the habit of drivers testing the internal
> netdev registration state to make decisions.
> 
> Instead, please track this internally.  You know if you registered the
> device or not, therefore use that to control whether you try to
> unregister it or not.

Fair enough.  Tuba, do you want to fix this up in this way, or do you
recommend that someone else do it?

thanks,

greg k-h