Re: [PATCH v1 5/5] driver-core: add driver asynchronous probe support

From: Dmitry Torokhov
Date: Sun Sep 28 2014 - 15:23:17 EST

Hi Luis,

On Fri, Sep 26, 2014 at 02:57:17PM -0700, Luis R. Rodriguez wrote:
> +static bool drv_enable_async_probe(struct device_driver *drv,
> + struct bus_type *bus)
> +{
> + struct module *mod;
> +
> + if (!drv->owner || drv->sync_probe)
> + return false;

This bit is one of the biggest issues I have with the patch set. Why async
probing is limited to modules only? I mentioned several times that we need
async probing for built-in drivers and the way you are structuring the flags
(async by default for modules, possibly opt-out of async for modules, forcibly
sync for built-in) it is hard to extend the infrastructure for built-in case.

Also, as far as I can see, you are only considering the case where driver is
being bound to already registered devices. If you have a module that creates a
device for a driver that is already loaded and takes long time to probe you
would still be probing synchronously even if driver/module requested async

So for me it is NAK in the current form.


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