linux-kernel - Re: [PATCH 1/2] dmaengine: TXx9 Soc DMA Controller driver

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Date:	Tue, 17 Mar 2009 10:02:14 -0700
From:	Dan Williams <dan.j.williams@...el.com>
To:	Atsushi Nemoto <anemo@....ocn.ne.jp>
Cc:	linux-mips@...ux-mips.org, ralf@...ux-mips.org,
	linux-kernel@...r.kernel.org, haavard.skinnemoen@...el.com
Subject: Re: [PATCH 1/2] dmaengine: TXx9 Soc DMA Controller driver

On Tue, Mar 17, 2009 at 9:09 AM, Atsushi Nemoto <anemo@....ocn.ne.jp> wrote:
> On Mon, 16 Mar 2009 21:52:10 -0700, Dan Williams <dan.j.williams@...el.com> wrote:
>> > Hmm.. why idr_ref is dynamically allocated?  Just putting it in
>> > dma_device makes thing more simple, no?
>>
>> The sysfs device has a longer lifetime than dma_device.  See commit
>> 41d5e59c [1].
>
> The sysfs device for dma_chan (dma_chan_dev) has a shorter lifetime
> than dma_device, doesn't it?

No,  dma_async_device_unregister(), and the freeing of dma_device, may
finish before chan_dev_release is called.  Userspace gates the final
release of dma_chan_dev objects.
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