if: Defer the if_up until the ifnet.if_ioctl is called.

[sepherosa_gmail.com]

Summary

This ensures the interface is initialized by the interface driver before it can be used by the rest of the system.

[jhb]

I would suggest rewording the message a bit to something like:

Defer if_up() until after the interface's if_ioctl method is called.

This ensures the interface is initialized by the interface driver before
it can be used by the rest of the system.

[sepherosa_gmail.com]

In D8905#185507, @jhb wrote:

I would suggest rewording the message a bit to something like:

Defer if_up() until after the interface's if_ioctl method is called.

This ensures the interface is initialized by the interface driver before
it can be used by the rest of the system.

Done. Thank you.

[karels]

Seems fine to me; will let someone else approve.