Re: [PATCH 2/2] Fix console handling during suspend/resume

[David Brownell <david-b@pacbell.net>]

On Thursday 15 June 2006 1:41 am, Pavel Machek wrote:
> On St 14-06-06 18:46:55, David Brownell wrote:
> > On Wednesday 14 June 2006 4:57 pm, Pavel Machek wrote:
> > 
> > > My point is that you really want the console enabled in writing phase
> > > of suspend-to-disk. 
> > 
> > Notice how nicely this generalizes a point that's been made before:
> > Linux should have the ability to exclude certain devices (and their
> > parents) from that first "prepare to suspend" phase.  Originally the
> 
> No, it does not. If your console needs DMA, you _need_ to stop it. If
> it can work without, you want to keep it enabled.
> 
> This has less to do with device types and trees and more to do with
> DMA or not.

Certainly there are details that need to be worked out, that's the
whole point of fixing some of these console+suspend problems.  And
DMA is one of them.

In this case, DMA only would need to be prevented during the actual
construction of the snapshot -- which is AFTER that "prepare to
suspend" phase, notice! -- so your straw-man doesn't apply.

- Dave