On Tue, 8 May 2007 13:01:21 -0700 (PDT),
Linus Torvalds <[email protected]> wrote:
> Instead of changing existign probe functionality to be asynchronous, we
> could *add* a new and asynchronous part to it. For example, we could make
> the rule for PCI - or other bus - devices be:
>
> - the bus will *first* call the "probe()" function synchronously.
>
> - after that one has completed, we will call "probe_async()"
> asynchronously at some point (it ie might be scheduled immediately
> after the "probe()" call, but delayed by some arbitrary issues like
> just already having too many asynchronous probes on-going or similar)
Hm. This would mean that probe() would be the decision "I want to use
this device", while probe_async() would be "setup my device, may take
some time"? Could work.
> So an unmodified driver would basically work exactly like it does now, but
> if a driver is happy with being called asynchronously, it could just
> change it's
>
> .probe = mydriver_probe
>
> thing into a
>
> .probe_async = mydriver_probe
>
> and we can do that ona per-driver basis with that kind of really simple
> one-liner change.
But probe would return int, while probe_async would return void? Two
liner :)
>
> In fact, there is nothing wrong with having *both* a synchronous part, and
> an async part:
>
> .probe = mydriver_setup,
> .probe_async = mydriver_spin_up_and_probe_devices,
>
> and it would do basic setup (including, for example, the fast enumeration
> of whatever devices are connected) synchronously, but then do anything
> more in the async part - and the async part would still be guaranteed that
> the setup has been run by the time it is scheduled (but not really have
> any other guarantees).
Looks like an idea.
I'll sleep on it, just too tired to make sense.
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