Re: patch for 2.5.42. 2/2

From: Pavel Machek (pavel@suse.cz)
Date: Tue Oct 15 2002 - 15:11:04 EST


Hi!

> > > better to just have the network layer stop operations when the
> > > system is going into suspend, instead of having to modify 100
> > > individual network drivers ?
> >
> > Whole userland is stopped at that point. That should mean that new
> > requests can not come.
> >
> > OTOH packet from the network *can* come, and higher levels can not do
> > much with that.
>
> Higher layers can throw away the packet. This means you just
> need to modify the higher layer at one or two places, instead
> of needing to modify every single network driver out there.
>
> I don't need to tell you which of these two options is gonna
> be the easiest to maintain, do I ?

No, that one is simple.

What is not so simple is seeing that throwing that packet away is not
enough. Receiving packet means DMA, and DMA is no-no during S4
resume. So simply throwing packet away is not enough.

                                                Pavel

-- 
Casualities in World Trade Center: ~3k dead inside the building,
cryptography in U.S.A. and free speech in Czech Republic.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/



This archive was generated by hypermail 2b29 : Tue Oct 15 2002 - 22:00:57 EST