Re: [PATCH 3/4] fsl-dma: support attribute of DMA_MEMORY when async_tx enabled

On Mon, Jul 9, 2012 at 10:59 PM, Qiang Liu [off-list ref] wrote:

- delete attribute of DMA_INTERRUPT because fsl-dma doesn't support
this function, exception will be thrown if talitos is used to compute xor
at the same time;
- change the release process of dma descriptor for avoiding exception when
enable config NET_DMA, release dma descriptor from 1st to last second, the
last descriptor which is reserved in current descriptor register may not be
completed, race condition will be raised if free current descriptor;
- use spin_lock_bh to instead of spin_lock_irqsave for improving performance;

A race condition which is raised when use both of talitos and dmaengine to
offload xor is because napi scheduler will sync all pending requests in dma
channels, it will affect the process of raid operations. The descriptor is
freed which is submitted just now, but async_tx must check whether this depend
tx descriptor is acked, there are poison contents in the invalid address,
then BUG_ON() is thrown, so this descriptor will be freed in the next time.

Cc: Dan Williams <redacted>
Cc: Vinod Koul <redacted>
Cc: Li Yang <redacted>
Signed-off-by: Qiang Liu <redacted>
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From the description this sounds like 3 or 4 patches.  Can you split it up?