linux-kernel - Re: [PATCH/RFC] core: add a function to safely try to get device driver owner

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Message-ID: <20101129152838.4ff57277@bike.lwn.net>
Date:	Mon, 29 Nov 2010 15:28:38 -0700
From:	Jonathan Corbet <corbet@....net>
To:	Guennadi Liakhovetski <g.liakhovetski@....de>
Cc:	Greg KH <greg@...ah.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH/RFC] core: add a function to safely try to get device
 driver owner

On Mon, 29 Nov 2010 23:10:50 +0100 (CET)
Guennadi Liakhovetski <g.liakhovetski@....de> wrote:

> In my case I have two platform devices: CEU and CSI2. In some cases (with 
> parallel sensors) CEU operates on its own. With serial (CSI-2) camera 
> sensors we need the CSI2 driver. So, I want to 
> try_module_get(csi2_dev->driver->owner) the CSI2 driver from my CEU 
> driver. This call can Oops if not done safely. Am I missing something? Is 
> there an easier way to achieve the same?

This looks exactly like what the V4L2 subdev mechanism was meant to do.
Is there a reason you can't use that interface?

Thanks,

jon
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