[PATCH 0/3] WLAN/SDIO power up/down synchronization

Werner Almesberger werner at openmoko.org
Sat Nov 22 17:30:52 CET 2008

[ I think this discussion is now going more into the realm of the
  "devel" list. Added Cc and Reply-To to that effect. Let's see
  if this works ;-) ]

Michael 'Mickey' Lauer wrote:
> Fwiw, the FSO team has finally chosen to base their networking on Intel's 
> connman. It's not very high on our priority list, but it's present.

Thanks ! Now, what do I do with people who have WLAN problems
right now ?

That's the old problem not having a clear direction for the network
manager caused for WLAN debugging: many of the reports were from a
fairly high-level view, which always made the dysfunctional network
manager a potential influence.

This could be "solved" by asking people to use command-line tools
like iwconfig, but there was still the risk of the network manager
kicking in. So the user space would have to be silenced as well. Of
course, just asking people to "kill all the daemons" doesn't
guarantee that they'll really catch everything.

Suspend/resume now adds another problem: if involuntary suspend
cannot be prevented, and the network manager isn't ready yet, the
network will appear to fail from time to time. (Because the WLAN
module gets reset during resume.)

One option would be to just ignore the higher layers of user space
for now and work on customized systems that don't go beyond a shell
and that never suspend unless explicitly told to do so.

That would allow the debugging to proceed, but it would of course
not make the whole phone more useful for our users.

So ... is there something better we can do ?

- Werner

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