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

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Date:	Tue, 17 Mar 2009 11:20:19 +0900 (JST)
From:	Atsushi Nemoto <anemo@....ocn.ne.jp>
To:	dan.j.williams@...el.com
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 Mon, 16 Mar 2009 14:50:46 -0700, Dan Williams <dan.j.williams@...el.com> wrote:
> > And above "continue" looks buggy anyway.  Keeping incomplete channels
> > in device->channels list looks very dangerous...
> 
> Yes it does.  Here is the proposed fix:
> ----->
> dmaengine: fail device registration if channel registration fails
> 
> From: Dan Williams <dan.j.williams@...el.com>
> 
> Atsushi points out:
> "If alloc_percpu or kzalloc failed, chan_id does not match with its
> position in device->channels list.
> 
> And above "continue" looks buggy anyway.  Keeping incomplete channels
> in device->channels list looks very dangerous..."
> 
> Reported-by: Atsushi Nemoto <anemo@....ocn.ne.jp>
> Signed-off-by: Dan Williams <dan.j.williams@...el.com>

Thanks, but it seems a hole sill exists.  If alloc_percpu or kzalloc
for the first channel failed, when idr_ref will be freed ?

Hmm.. why idr_ref is dynamically allocated?  Just putting it in
dma_device makes thing more simple, no?

---
Atsushi Nemoto
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