device open function not called on ifconfig up

[Rajeevalochan <rajeevalochan.ramaswamy@wipro.com>]

hi,

I am implementing a network driver for IXP2400 quad gigabit ethernet 
card as a loadable linux module. After loading the module (network 
driver) "ifconfig -a" shows all the existing interfaces. But upon 
bringing the interface up using "ifconfig ixp0 up" (ixp0 is the name of 
one of the interfaces), the device Close function is getting invoked 
instead of device open function. Any idea why this happens?

In file, net/core/dev.c, in function dev_change_flags(), the following 
code shows a call to device close function if a condition is true. But I 
have initialised the device flags to 0 in device probe function.

       if ((old_flags^flags)&IFF_UP)   /* Bit is different  ? */
       {
               ret = ((old_flags & IFF_UP) ? dev_close : dev_open)(dev);

               if (ret == 0)
                       dev_mc_upload(dev);
       }

I could not find any other call to the device close function in the 
kernel source other than the above and one during unregistering the 
device. Please clarify ...

thanks and regards,
Rajeevalochan Ramaswamy


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