| To: | Atsushi Nemoto <anemo@mba.ocn.ne.jp> |
|---|---|
| Subject: | Re: [PATCH 1/2] dmaengine: TXx9 Soc DMA Controller driver |
| From: | Dan Williams <dan.j.williams@intel.com> |
| Date: | Tue, 17 Mar 2009 10:02:14 -0700 |
| Cc: | linux-mips@linux-mips.org, ralf@linux-mips.org, linux-kernel@vger.kernel.org, haavard.skinnemoen@atmel.com |
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| In-reply-to: | <20090318.010939.128619068.anemo@mba.ocn.ne.jp> |
| Original-recipient: | rfc822;linux-mips@linux-mips.org |
| References: | <1237240246.27945.6.camel@dwillia2-linux.ch.intel.com> <20090317.112019.147212126.nemoto@toshiba-tops.co.jp> <e9c3a7c20903162152w6b73b4b8hba8004e7b349c447@mail.gmail.com> <20090318.010939.128619068.anemo@mba.ocn.ne.jp> |
| Sender: | linux-mips-bounce@linux-mips.org |
On Tue, Mar 17, 2009 at 9:09 AM, Atsushi Nemoto <anemo@mba.ocn.ne.jp> wrote: > On Mon, 16 Mar 2009 21:52:10 -0700, Dan Williams <dan.j.williams@intel.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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