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Message-ID: <437AE21D.9040501@gmail.com>
Date: Wed, 16 Nov 2005 15:39:09 +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> <43795C71.6070108@gmail.com> <20051115153444.GB15733@linux-mips.org>
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Ralf Baechle wrote:
> On Tue, Nov 15, 2005 at 11:56:33AM +0800, Tony wrote:
> 
> 
>>>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.
> 
> 
> register_netdev / unregister_netdev don't deal with the .owner stuff, so
> your bug isn't there.  If your NIC is a PCI card, it should register it's
> driver through pci_register_driver which would deal with the necessary
> reference counting.  If it's implemented as a platform device you're
> presumably calling driver_register() before platform_device_register() and
> driver_register() would do the necessary magic for you.  If you're using a
> different bus it may have it's own variant of driver_register which you
> should call.  If you don't, you have a problem :-)
> 
>   Ralf
> 
That is indeed my problem. My driver is none of types of drivers, it's 
just a software virtual one. I think I should mimic the way SLIP handle 
it. thank a loooooooot!!!

Tony
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