linux-kernel - Re: [PATCH] driver core: remove polling for driver_probe

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Date:	Fri, 30 Jan 2009 11:30:43 +0100
From:	Cornelia Huck <cornelia.huck@...ibm.com>
To:	Ming Lei <tom.leiming@...il.com>
Cc:	kay.sievers@...y.org, greg@...ah.com, arjan@...radead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] driver core: remove polling for driver_probe_done(v2)

On Fri, 30 Jan 2009 18:17:36 +0800,
Ming Lei <tom.leiming@...il.com> wrote:

> If probing done does not mean the device is available, this patch should be
> ignored or fixed further.
> 
> But polling is really not good, is there a approach to avoid the polling for
> appearence of the root device?

I think the parts of your patch that replace polling for
driver_probe_done() with waiting on the waitqueue are fine. The
problematic part is the rootwait special case, where polling seems
unavoidable afaics.
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