netdev - Re: [PATCH 1/2] fsl/fman: propagate dma

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Message-ID: <CAMuHMdU6hkU03s2ZBYEYdOqO3M1djbjZ0YKw8VbHYEvsNxLZxw@mail.gmail.com>
Date:   Mon, 26 Jun 2017 09:48:54 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     madalin.bucur@....com
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] fsl/fman: propagate dma_ops

Hi Madalin,

On Mon, Jun 19, 2017 at 5:04 PM, Madalin Bucur <madalin.bucur@....com> wrote:
> Make sure dma_ops are set, to be later used by the Ethernet driver.
>
> Signed-off-by: Madalin Bucur <madalin.bucur@....com>
> ---
>  drivers/net/ethernet/freescale/fman/mac.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/net/ethernet/freescale/fman/mac.c b/drivers/net/ethernet/freescale/fman/mac.c
> index 0b31f85..6e67d22f 100644
> --- a/drivers/net/ethernet/freescale/fman/mac.c
> +++ b/drivers/net/ethernet/freescale/fman/mac.c
> @@ -623,6 +623,8 @@ static struct platform_device *dpaa_eth_add_device(int fman_id,
>                 goto no_mem;
>         }
>
> +       set_dma_ops(&pdev->dev, get_dma_ops(priv->dev));
> +

When compile-testing with f NO_DMA=y:

    drivers/net/ethernet/freescale/fman/mac.c: In function
‘dpaa_eth_add_device’:
    drivers/net/ethernet/freescale/fman/mac.c:626: error: implicit
declaration of function ‘set_dma_ops’

Reverting commit 5567e989198b5a8d fixes this regression in v4.12-rc7.

Why is this change needed?
There's no single other call to the DMA API in this file?

If it's really needed, can't set_dma_ops() be called from the driver that
needs it, cfr. your other patch "[PATCH 2/2] dpaa_eth: reuse the dma_ops
provided by the FMan MAC device"?

Thanks!

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds