netdev - Re: Error in the hso driver

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Date:   Sun, 27 Jan 2019 20:30:38 +0000
From:   "Yavuz, Tuba" <tuba@....ufl.edu>
To:     Andrew Lunn <andrew@...n.ch>
CC:     Greg KH <greg@...ah.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "davem@...emloft.net" <davem@...emloft.net>
Subject: Re: Error in the hso driver

I agree and it would be much easier to track cleanup operations. I think this is happening because probe function calls hso_create_net_device, which performs the cleaning. The driver may need some revision to achieve cleanup inside the probe,

Best,

Tuba Yavuz, Ph.D.
Assistant Professor
Electrical and Computer Engineering Department
University of Florida
Gainesville, FL 32611
Webpage: http://www.tuba.ece.ufl.edu/
Email: tuba@....ufl.edu
Phone: (352) 846 0202

________________________________________
From: Andrew Lunn <andrew@...n.ch>
Sent: Sunday, January 27, 2019 3:19 PM
To: Yavuz, Tuba
Cc: Greg KH; netdev@...r.kernel.org; davem@...emloft.net
Subject: Re: Error in the hso driver

On Sun, Jan 27, 2019 at 07:49:52PM +0000, Yavuz, Tuba wrote:
> Here is a proposed patch:
>
> --- drivers/net/usb/hso.c.orig        2019-01-27 14:45:58.232683119 -0500
> +++ drivers/net/usb/hso.c     2019-01-27 14:47:43.592683629 -0500
> @@ -2377,7 +2377,7 @@ static void hso_free_net_device(struct h
>
>       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 */

Hi Tuba

Using the free function from the probe often has problems. It is
better to put the cleanup at the end of the probe, and use a
collection of goto's and labels.

           Andrew