Re: [RFC v1 0/3] driver-core: add asynch module loading support

[Arjan van de Ven]

On 8/31/2014 3:53 PM, Tejun Heo wrote:
> Hello,
>
> On Sun, Aug 31, 2014 at 03:15:34PM -0700, Greg KH wrote:
> > For the use cases we have today, it would work.  We have a few drivers
> > that take a _long_ time in their probe callback, and they need to be
> > made async for various reasons (modprobe timeout killer, touchscreen
> > init sequence stalling boot, etc.)
>
> Oh, but there already is a reported case which fails.  Hard drives
> with a lot of platters take > 10secs to spin up and there are
> configurations which regularly fail the initial reset and it's quite
> rare but probing time taking over 30s does happen in the wild.  We
> can't mark libata as requiring async probing on module load
> unconditionally but at the same time we need them to be asynchronous
> for use cases which don't depend on synchronous behavior has has
> timeout.

libata probing is already async thankfully.

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