linux-kernel - Re: [PATCH 1/4] dmaengine: add a release for dma class devices and dependent infrastructure

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Date:	Wed, 3 Dec 2008 17:07:41 -0800
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	linux-kernel@...r.kernel.org,
	Haavard Skinnemoen <haavard.skinnemoen@...el.com>,
	Alexander Beregalov <a.beregalov@...il.com>
Subject: Re: [PATCH 1/4] dmaengine: add a release for dma class devices and
 dependent infrastructure

On Wed, 03 Dec 2008 17:46:46 -0700
Dan Williams <dan.j.williams@...el.com> wrote:

> Resolves:
> WARNING: at drivers/base/core.c:122 device_release+0x4d/0x52()
> Device 'dma0chan0' does not have a release() function, it is broken and must be fixed.
> 
> The dma_chan_dev object is introduced to gear-match sysfs kobject and
> dmaengine channel lifetimes.  When a channel is removed access to the
> sysfs entries return -ENODEV until the kobject can be released.
> 
> The bulk of the change is updates to existing code to handle the extra
> layer of indirection between a dma_chan and its struct device.
> 
> Reported-by: Alexander Beregalov <a.beregalov@...il.com>
> Cc: Stephen Hemminger <shemminger@...tta.com>
> Cc: Haavard Skinnemoen <haavard.skinnemoen@...el.com>
> Signed-off-by: Dan Williams <dan.j.williams@...el.com>

Much better thanks.
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