On 2012-11-21 10:32, Alex Courbot wrote:

quoted

Ok. I'll need to dig up the conversation

IIRC it was somewhere around here:

https://lkml.org/lkml/2012/9/7/662

See the parent messages too.

Thanks.

quoted

Did you consider any examples
of how some driver could handle the error cases?

For all the (limited) use cases I considered, playing the power-off sequence 
when power-on fails just works. If power-off also fails you are potentially in 
more trouble though. Maybe we could have another "run" function that does not 
stop on errors for handling such cases where you want to "stop everything you 
can".

If the power-off sequence disables a regulator that was supposed to be
enabled by the power-on sequence (but wasn't enabled because of an
error), the regulator_disable is still called when the driver runs the
power-off sequence, isn't it? Regulator enables and disables are ref
counted, and the enables should match the disables.

Failures might be better handled if sequences have some "recovery policy" 
about what to do when they fail, as mentioned in the link above. As you 
pointed out, the driver might not always know enough about the resources 
involved to do the right thing.

Yes, I think such recovery policy would be needed.

 Tomi