linux-kernel - Re: dmaengine.c: question about device_alloc_chan

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Message-ID: <ed82fe3e0809180713v7e7a6115ya4612aa68879e39d@mail.gmail.com>
Date:	Thu, 18 Sep 2008 09:13:56 -0500
From:	"Timur Tabi" <timur@...escale.com>
To:	"Dan Williams" <dan.j.williams@...el.com>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	"Haavard Skinnemoen" <haavard.skinnemoen@...el.com>
Subject: Re: dmaengine.c: question about device_alloc_chan_resources

On Wed, Sep 17, 2008 at 5:36 PM, Dan Williams <dan.j.williams@...el.com> wrote:

> I believe the problem is that dmatest is telling the core to take
> multiple references on a channel.  Take a look at
> net/core/dev.c:netdev_dma_event and
> crypto:asynx_tx/async_tx.c:dma_channel_add_remove both of those check
> to see if they already have a refence to the channel.

Ok, I see what these functions are doing, and dmatest_add_channel() is
not doing it.  dmatest_add_channel() should not assume that it will
only receive one and only one DMA_RESOURCE_AVAILABLE for each channel.

I'll post a patch, if Haavard doesn't do it first.  Thanks for looking
into this and getting back to me.  I've spent the entire week
debugging this.

-- 
Timur Tabi
Linux kernel developer at Freescale
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