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Message-ID: <43795C71.6070108@gmail.com>
Date: Tue, 15 Nov 2005 11:56:33 +0800
From: Tony <tony.uestc@gmail.com>
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To: Ralf Baechle <ralf@linux-mips.org>
CC: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: MOD_INC_USE_COUNT
References: <437347B5.6080201@gmail.com> <Pine.LNX.4.61.0511100859400.18912@chaos.analogic.com> <43735766.3070205@gmail.com> <20051113102930.GA16973@linux-mips.org>
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Ralf Baechle wrote:
> On Thu, Nov 10, 2005 at 10:21:26PM +0800, Tony wrote:
> 
> 
>>But when the module is used by a net_device(interface is up), rmmod also 
>>works. Strange, isn't it?
> 
> 
> Not strange at all.  The typical network driver is implemented using
> pci_register_driver which will set the owner filed of the driver's struct
> driver which then is being used for internal reference counting.  Other
> busses or line disciplines (SLIP, PPP, AX.25 ...) need to do the equivalent
> or the kernel will believe reference counting isn't necessary and it's
> ok to unload the module at any time.
> 
> In which driver did you hit this problem?
> 
>   Ralf
> 
I have a radio connected to host using ethernet. I'm writing a radio 
driver that masquerade radio as a NIC. when the module is loaded, I just 
register_netdev a net_device struct, while unregister_netdev at module 
cleanup.

Tony
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