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Date:	Mon, 28 Jul 2014 18:52:48 +0200
From:	"Luis R. Rodriguez" <>
To:	Yuval Mintz <>
Cc:	"Luis R. Rodriguez" <>,
	"" <>,
	linux-kernel <>,
	Tetsuo Handa <>,
	Joseph Salisbury <>,
	Kay Sievers <>,
	One Thousand Gnomes <>,
	Tim Gardner <>,
	Pierre Fersing <>,
	Andrew Morton <>,
	Oleg Nesterov <>,
	Benjamin Poirier <>,
	Nagalakshmi Nandigama <>,
	Praveen Krishnamoorthy <>,
	Sreekanth Reddy <>,
	Abhijit Mahajan <>,
	Hariprasad S <>,
	Santosh Rastapur <>,
	linux-scsi <>,
	netdev <>
Subject: Re: [PATCH 1/3] driver core: enable drivers to use deferred probe
	from init

On Mon, Jul 28, 2014 at 03:46:32PM +0000, Yuval Mintz wrote:
> > Subject: Re: [PATCH 1/3] driver core: enable drivers to use deferred probe from
> > init
> > 
> > On Mon, Jul 28, 2014 at 03:12:11PM +0000, Yuval Mintz wrote:
> > > Perhaps this is a silly question, but what guarantees that the
> > > deferred probe list will actually be triggered, e.g., in case the
> > > delayed device is the last device in the system?
> > 
> > The dev->init_delayed_probe is used to ensure that we'd add the device to the
> > deferred probe list once making this a per device thing if the driver has the field
> > delay_probe set to true. This technically also allows this to be a per device thing
> > so with some more work we could enable drivers to only enable this for specific
> > devices but at this point this did not seem required.
> Sorry for not being clear, but I didn't meant 'what guarantees that the device
> will be added to the deferred probe', but rather what guarantees that the
> deferred workqueue will be scheduled.
> To the best of my knowledge the deferring mechanism works only if one device
> is dependent upon another, e.g., for Multi-function devices where one device
> probe is dependent upon the others - which are soon-to-be probed.

The workqueue will be kicked when driver_deferred_probe_trigger() gets
poked, we do that in the late_initcall(deferred_probe_initcall), it
also gets flushed there with a flush_workqueue(deferred_wq).

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