linux-kernel - Re: [Q] reprobe deferred-probing drivers

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Message-ID: <Pine.LNX.4.64.1210171039410.7402@axis700.grange>
Date:	Wed, 17 Oct 2012 10:43:20 +0200 (CEST)
From:	Guennadi Liakhovetski <g.liakhovetski@....de>
To:	linux-kernel@...r.kernel.org
cc:	Linux Media Mailing List <linux-media@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [Q] reprobe deferred-probing drivers

On Wed, 17 Oct 2012, Guennadi Liakhovetski wrote:

> Hi
> 
> I've got a situation, for which I currently don't have a (good) solution.

Ok, right, would it be acceptable to just do something like

		if (dev->parent)
			device_lock(dev->parent);
		device_release_driver(dev);
		device_attach(dev);

?

Thanks
Guennadi

> Let's say device A depends on device B and as long as B hasn't probed, A 
> requests deferred probing. Now B probes, which causes A to also succeed 
> its probing. Next we want to remove B, say, by unloading its driver. A has 
> to go back into "deferred-probing" state. How do we do it? This can be 
> achieved by unloading B's driver and loading again. Essentially, we have 
> to use the sysfs "unbind" and then the "bind" attributes. But how do we do 
> this from the kernel? Shall we export driver_bind() and driver_unbind()?

---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/
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