linux-kernel - Re: [PATCH 08/13] dmatest: convert to dma_request

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Message-Id: <20081114221704.fe9ea599.akpm@linux-foundation.org>
Date:	Fri, 14 Nov 2008 22:17:04 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	maciej.sosnowski@...el.com, hskinnemoen@...el.com,
	g.liakhovetski@....de, nicolas.ferre@...el.com
Subject: Re: [PATCH 08/13] dmatest: convert to dma_request_channel

On Fri, 14 Nov 2008 14:34:58 -0700 Dan Williams <dan.j.williams@...el.com> wrote:

>  static int __init dmatest_init(void)
>  {
> -	dma_cap_set(DMA_MEMCPY, dmatest_client.cap_mask);
> -	dma_async_client_register(&dmatest_client);
> -	dma_async_client_chan_request(&dmatest_client);
> +	dma_cap_mask_t mask;
> +	struct dma_chan *chan;
> +
> +	dma_cap_zero(mask);
> +	dma_cap_set(DMA_MEMCPY, mask);
> +	for (;;) {
> +		chan = dma_request_channel(mask, filter, NULL);
> +		if (chan) {
> +			if (dmatest_add_channel(chan) == 0)
> +				continue;

hrm.  I trust this loop can't lock up the box.

> +			else
> +				dma_release_channel(chan);
> +		} else
> +			break; /* no more channels available */
> +		if (max_channels && nr_channels >= max_channels)
> +			break; /* we have all we need */
> +	}
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