Re: [PATCH] tun driver use private linked list.

[Max Krasnyansky <maxk@xxxxxxxxxxxx>]

At 01:18 AM 8/9/2003, David S. Miller wrote:
>On Fri, 8 Aug 2003 11:34:04 -0700
>Stephen Hemminger <shemminger@xxxxxxxx> wrote:
>
>> Less grotty version, applies over earlier patch.
>>       - keep a private list.  
>>       - fix debug format strings.
>>       - drop the name entry in the private data structure since it already
>>         has a pointer to netdev that has name.
>
>Applied, thanks for following up on this Stephen.

Folks,

Sorry for jumping in late. 
I didn't implement cleanup logic in module_exit() because TUN module is not 
supposed 
to be unloaded if it has network devices, _even if those devices are down_.
TUN registers net device only when user application asks for it.
        fd = open("/dev/net/tun") -> ioctl(fd, CREATE_TUN_DEV) -> 
read(fd)/write(fd);
Net device must not be destroyed while fd is open.

So instead of cleaning up in tun_module_exit() we should fix misc driver to do 
refcounting 
for misc devices so that we could bump ref count for tun driver when 
application creates
net device.

Max