lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:	Mon, 28 Jul 2014 18:59:20 +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 06:52:48PM +0200, Luis R. Rodriguez wrote:
> 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).

But come to think of it that will work well for devices already plugged in
so indeed I think that driver_deferred_probe_add() needs a check added
for for if (!driver_deferred_probe_enable) then we have to
driver_deferred_probe_trigger(). The driver_deferred_probe_enable is set
to false upon init, but later on late init it gets set to true so with
that check we'd  only generate the trigger after late init call.

I can fold that in the v2.

To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to
More majordomo info at

Powered by blists - more mailing lists