Re: Rework of request firmware

[Jon Smirl <jonsmirl@gmail.com>]

On Tue, 22 Mar 2005 03:25:05 +0100, Kay Sievers <kay.sievers@vrfy.org> wrote:
> This way we can replay or cancel events at any time if something goes
> wrong. We would get a generic transaction model for the kernel to
> request a configuration action from userspace like copying a firmware
> image, setup a device or run any other userspace helper.
> 
> How does that sound? Can this work?

That's what I was trying to get at. It's the abort of the event that
causes problems. The better model is that the event stays active until
it is satisfied -- there is no way to automatically abort it. If the
event has not been satisfied by module exit time it just gets cleaned
up.

It would be convenient to have a sysfs variable on an event like
'replay'. If I set 'replay' to 1 the event will get regenerated to
/sbin/hotplug. After I fix things  I could manually retrigger the
event and it would run in the hotplug execution environment. You might
not even need to be root to trigger a replay.

Timeout is still useful. Timeout tells the system to generate a user
message saying that the device is stuck. But timeout should not abort
the event.

What about a universal driver model for this? Right now we have
probe(). Should we add post()? If post() is null just call probe(). If
the driver has a post() function call it instead. The completion event
would then call probe(). probe() could still fail and the driver would
not be activated.

Doing it in the driver layer makes this process standard. Now we can
add a uniform device attribute like status. status=offline,
status=posting, status=online.

You could probably cancel an event. Canceling an event would remove it
from sysfs and make sure probe() never gets called. Status would stay
at offline. The only way to reactivate the device would be to remove
the driver. I don't think we need cancel but if it is there it would
be a user controlled action.

-- 
Jon Smirl
jonsmirl@gmail.com


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