VLAN interface management - unloading carrying driver hangs the machine

[Yony Yossef]

> Jack Vogel wrote:
> >
> >
> > On Wed, Jan 7, 2009 at 9:54 AM, Sam Leffler <sam at freebsd.org 
> > <mailto:sam at freebsd.org>> wrote:
> >
> >     Yony Yossef wrote:
> >
> >             Yony Yossef wrote:
> >                
> >
> >                 /sbin/ifconfig vlan3653 create
> >
> >                 Problem is when I assign an IP to the vlan 
> interface.
> >                 In that case, unloading the driver results 
> in hanging
> >                 the host.
> >                  Does it sound familiar to anybody?
> >                      
> >
> >             Well, surely I'd expect problems by doing so.
> >             The correct way is to
> >
> >                    /sbin/ifconfig vlan3653 destroy
> >
> >             before unloading the driver.
> >
> >             Angelo.
> >                
> >
> >
> >         Thanks, I didn't know freebsd does not allow it.
> >
> >          
> >
> >     This seems wrong. Someone should disallow the driver
> >     detach/unload. Please file a PR about this so the issue 
> is not lost.
> >
> >     Sam
> >
> >
> > In many drivers, ahem, like mine, there is a test at detach and it 
> > will not allow it if there is a non-NULL trunk.
> >
> > Sounds like a broken driver needs to be fixed is all...
> >
> I don't agree; drivers should not be required to deal with 
> this.  If someone files a PR and assigns it to me I'll look at it.
> 
>     Sam
> 

I agree with Sam. There's no reason to leave this check to the driver.

Yony