Re: [PATCH net-next v4 05/22] ethtool: introduce ethtool netlink interface

From: Michal Kubecek
Date: Thu Mar 21 2019 - 10:13:50 EST

On Thu, Mar 21, 2019 at 02:57:05PM +0100, Andrew Lunn wrote:
> On Thu, Mar 21, 2019 at 02:07:35PM +0100, Michal Kubecek wrote:
> > +static int __init ethnl_init(void)
> > +{
> > + int ret;
> > +
> > + ret = genl_register_family(&ethtool_genl_family);
> > + if (ret < 0)
> > + panic("ethtool: could not register genetlink family\n");
> Panic seems a bit strong. Do we really want to kill the box because
> this fails?

When I switched CONFIG_ETHTOOL_NETLINK from tristate to bool, I checked
some other non-modular subsystems to see what they do on failed
initialization and each of them did handle it by panic() so I didn't
think about it too much and did the same.

Thinking about it now, if the family registration fails, the only entry
point to care about should be ethtool_notify() (I'll have to check more
carefully to be sure) so that adding a check there should be sufficient
to let everything work (except for the netlink interface, of course).