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

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Message-ID: <20140928192247.GA28033@core.coreip.homeip.net>
Date:	Sun, 28 Sep 2014 12:22:47 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>
Cc:	gregkh@...uxfoundation.org, tiwai@...e.de, tj@...nel.org,
	arjan@...ux.intel.com, teg@...m.no, rmilasan@...e.com,
	werner@...e.com, oleg@...hat.com, hare@...e.com, bpoirier@...e.de,
	santosh@...lsio.com, pmladek@...e.cz, dbueso@...e.com,
	mcgrof@...e.com, linux-kernel@...r.kernel.org,
	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
	Joseph Salisbury <joseph.salisbury@...onical.com>,
	Kay Sievers <kay@...y.org>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Tim Gardner <tim.gardner@...onical.com>,
	Pierre Fersing <pierre-fersing@...rref.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Nagalakshmi Nandigama <nagalakshmi.nandigama@...gotech.com>,
	Praveen Krishnamoorthy <praveen.krishnamoorthy@...gotech.com>,
	Sreekanth Reddy <sreekanth.reddy@...gotech.com>,
	Abhijit Mahajan <abhijit.mahajan@...gotech.com>,
	Casey Leedom <leedom@...lsio.com>,
	Hariprasad S <hariprasad@...lsio.com>,
	MPT-FusionLinux.pdl@...gotech.com, linux-scsi@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH v1 5/5] driver-core: add driver asynchronous probe support

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
behavior.

So for me it is NAK in the current form.

Thanks.

-- 
Dmitry
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