VLAN interface management - unloading carrying driver hangs the machine

[Sam Leffler]

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