[Bug 110284] [if_ethersubr] Invalid Assumption in SIOCSIFADDR in ether_ioctl()

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=110284

--- Comment #8 from Zhenlei Huang <zlei@FreeBSD.org> ---
Note that, the `IFF_DRV_RUNNING ` flag is a driver managed flag. It should be
read or written under driver managed lock. It is encouraged to handle the
running state in the driver, typically the `ifp->if_init()` routine, rather
than in the net stack.

Many many drivers already have this ( similar ) logic in the init routine,

```
foo_init(sc)
{
    foo_driver_lock(sc);
    foo_init_locked(sc);
    foo_driver_unlock(sc);
}

foo_init_locked(sc)
{
    assert_foo_driver_locked(sc);

    if (ifp->if_drv_flags & IFF_DRV_RUNNING != 0)
        return;

    /* handle hw init */
    .... 

    /* ready */
    ifp-> if_drv_flags |= IFF_DRV_RUNNING;
}
```

So this patch is not relevant anymore.

See also change https://cgit.freebsd.org/src/commit/?id=879773c18b50 which did
the opposite to this patch.

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