On Wed, 16 Jun 2010 18:16:32 -0700 (PDT)
David Miller <davem@xxxxxxxxxxxxx> wrote:
> From: James Bottomley <JBottomley@xxxxxxxxxx>
> Date: Wed, 16 Jun 2010 20:13:49 -0500
>
> > However, this code in bnx2.c:
> >
> > if (!get_dma_ops(&pdev->dev)->sync_single_for_cpu) {
> > next_rx_buf =
> > &rxr->rx_buf_ring[
> > RX_RING_IDX(NEXT_RX_BD(sw_cons))];
> > prefetch(next_rx_buf->desc);
> > }
> >
> > Looks remarkably fragile: what exactly is it trying to do?
> >
> > The commit that causes the problem:
> >
> > commit a33fa66bcf365ffe5b79d1ae1d3582cc261ae56e
> > Author: Michael Chan <mchan@xxxxxxxxxxxx>
> > Date: Thu May 6 08:58:13 2010 +0000
> >
> > bnx2: Add prefetches to rx path.
> >
> > Looks fairly innocuous by the description.
> >
> > Should parisc have a get_dma_ops()? We don't need one because our dma
> > ops are per platform not per bus.
>
> I think asking for get_dma_ops() directly in a driver is dodgy at
> best, especially one that is meant to compile on any PCI supporting
> system. At least right now.
Yeah, it should be used only in the architecture core
code. get_dma_ops() is not mentioned in DMA-API-* docs.
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