Re: [RFC][PATCH] netbase: don't start udhcpc if kernel assigned IP statically

[Denys Dmytriyenko <denis@denix.org>]

On Tue, Sep 22, 2009 at 02:28:32PM +0100, Phil Blundell wrote:
> On Mon, 2009-09-21 at 18:39 -0400, Denys Dmytriyenko wrote:
> > On Mon, Sep 21, 2009 at 08:45:06PM +0100, Phil Blundell wrote:
> > > It seems like there must be a better way of solving this problem.  How
> > > about just teaching "ifup -a" to spot interfaces that are already up and
> > > leave them alone?
> > 
> > Won't work for the case of kernel-acquired DHCP address, i.e. kernel level 
> > autoconfig, aka IP_PNP, aka ip=dhcp command line.
> 
> True, but your original patch won't help with this situation either
> (since "ip=dhcp" won't match the regex).  I think this is a different

Not true. The default is to start udhcpc always. I just cover one case to 
prevent it from starting when ip=x.x.x.x

> problem and probably requires a different solution: the ideal thing
> would be for the kernel to set a flag on the interface to say that it
> needs to be taken over by a DHCP client, or alternatively to invoke the
> DHCP client itself via the hotplug mechanism.  Failing that you could
> arrange for the startup scripts to poke around at /proc/cmdline and try
> to second-guess what the kernel has done, although that would be rather
> less satisfactory.