On Fri, Oct 26, 2007 at 04:56:48PM -0700, Shannon Nelson wrote:

quoted text
>  static void dma_dev_release(struct device *dev)
>  {
> -	struct dma_chan *chan = to_dma_chan(dev);
> -	kref_put(&chan->device->refcount, dma_async_device_cleanup);
> +	return;
>  }

Practically guaranteed to be broken.  Empty ->release() is almost certain
to mean that you can get operations on already freed object.
-
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