linux-kernel - Re: bnx2 fails to compile on parisc because of missing get_dma

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Message-ID: <AANLkTilSfOwwT87mgDcWBogL4gPnM7VBTOALKpZv_upN@mail.gmail.com>
Date:	Wed, 16 Jun 2010 21:17:15 -0400
From:	Mike Frysinger <vapier@...too.org>
To:	James Bottomley <JBottomley@...ell.com>
Cc:	netdev@...r.kernel.org, linux-parisc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Michael Chan <mchan@...adcom.com>
Subject: Re: bnx2 fails to compile on parisc because of missing get_dma_ops()

On Wed, Jun 16, 2010 at 9:13 PM, James Bottomley wrote:
> I'm not quite sure whose fault this one is.
>
> 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@...adcom.com>
> 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.

looks like it'll be broken on more than just parisc:
$ grep get_dma_ops arch/*/include/asm/ -rl | cut -d/ -f 2
alpha
ia64
microblaze
powerpc
sh
sparc
x86
-mike
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