Messages in this thread | | | Date | Wed, 16 Nov 2005 13:24:21 +0000 | From | Ralf Baechle <> | Subject | Re: MOD_INC_USE_COUNT |
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On Wed, Nov 16, 2005 at 03:39:09PM +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!!!
SLIP is a line discipline; it's reference counting happens through tty_register_ldisc() but probably your code isn't a line discipline ... You however might use the platform device code - see include/linux/platform_device.h and the many users throughout the kernel. The platform device concept was really meant to support physical hardware but it should work just fine in your case. Maybe drivers/net/mipsnet.c can serve as an example - it's a driver for virtual NIC on a software emulator.
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