Re: MOD_INC_USE_COUNT

[Tony <tony.uestc@gmail.com>]

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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