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

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Date:	Sun, 31 Aug 2014 15:51:40 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	"Luis R. Rodriguez" <mcgrof@...not-panic.com>, falcon@...zu.com,
	tiwai@...e.de, linux-kernel@...r.kernel.org, oleg@...hat.com,
	akpm@...ux-foundation.org, penguin-kernel@...ove.sakura.ne.jp,
	joseph.salisbury@...onical.com, bpoirier@...e.de,
	"Luis R. Rodriguez" <mcgrof@...e.com>
Subject: Re: [RFC v1 0/3] driver-core: add asynch module loading support

On Sun, Aug 31, 2014 at 05:53:13PM -0400, Tejun Heo wrote:
> Hello, Greg.
> 
> On Sun, Aug 31, 2014 at 01:40:35PM -0700, Greg KH wrote:
> > > Right, all (well almost all) I wanted is for individual drivers to declare
> > > their probe() functions asynchronous and driver core scheduling async attach
> > > and properly handle failures from it.
> > 
> > Yes, that's what I want as well.
> > 
> > Luis, care to redo the patches in this way?  It should be a lot simpler
> > (no messing around with init levels and linker fun...)
> 
> I don't think binding that switch to the driver is gonna work.  This
> is mainly about the behavior expected by the entity which initiated
> module loading not about specific drivers.

Why would you say that? In my particular userspace we do not have modules.

>  I'm fairly certain that
> there are userland scripts which depend on synchronous device probing
> on module loading, especially for storage devices, so we can't simply
> mark, say, libata as needing async probing and do it always
> asynchronously.

Right. But for many devices (input ones for example, USB as well, etc) that are
essentially hot-pluggable userspace has been long ready to handle async order.

Thanks.

-- 
Dmitry
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