netdev - Re: [PATCH net-next] net: stmmac: Handle different error codes from platform_get_irq

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Date:	Tue, 27 May 2014 19:58:01 -0500
From:	Rob Herring <robh@...nel.org>
To:	Chen-Yu Tsai <wens@...e.org>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Giuseppe Cavallaro <peppe.cavallaro@...com>,
	netdev <netdev@...r.kernel.org>,
	Grygorii Strashko <grygorii.strashko@...com>,
	Russell King <linux@....linux.org.uk>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Kevin Hilman <khilman@...aro.org>
Subject: Re: [PATCH net-next] net: stmmac: Handle different error codes from platform_get_irq_byname

On Mon, May 26, 2014 at 11:49 PM, Chen-Yu Tsai <wens@...e.org> wrote:
> The following patch moved device tree interrupt resolution into
> platform_get_irq_byname:
>
>   ad69674 of/irq: do irq resolution in platform_get_irq_byname()
>
> As a result, the function no longer only return -ENXIO on error.
> This breaks DT based probing of stmmac, as seen in test runs of
> linux-next next-20140526 cubie2-sunxi_defconfig:
>
>   http://lists.linaro.org/pipermail/kernel-build-reports/2014-May/003659.html
>
> This patch makes the stmmac_platform probe function properly handle
> error codes, such as returning for deferred probing, and other codes
> returned by of_irq_get_by_name.

ST u8500 is also broken as reported by Kevin Hilman.

>
> Signed-off-by: Chen-Yu Tsai <wens@...e.org>
> ---
>  .../net/ethernet/stmicro/stmmac/stmmac_platform.c    | 20 +++++++++++++++-----
>  1 file changed, 15 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> index 46aef510..9562b18 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> @@ -237,10 +237,12 @@ static int stmmac_pltfr_probe(struct platform_device *pdev)
>
>         /* Get the MAC information */
>         priv->dev->irq = platform_get_irq_byname(pdev, "macirq");
> -       if (priv->dev->irq == -ENXIO) {
> -               pr_err("%s: ERROR: MAC IRQ configuration "
> -                      "information not found\n", __func__);
> -               return -ENXIO;
> +       if (priv->dev->irq < 0) {
> +               if (priv->wol_irq != -EPROBE_DEFER) {

s/wol_irq/dev->irq/

> +                       pr_err("%s: ERROR: MAC IRQ configuration "

netdev_err

> +                              "information not found\n", __func__);

Don't split strings.

> +               }
> +               return priv->dev->irq;
>         }
>
>         /*
> @@ -252,10 +254,18 @@ static int stmmac_pltfr_probe(struct platform_device *pdev)
>          * so the driver will continue to use the mac irq (ndev->irq)
>          */
>         priv->wol_irq = platform_get_irq_byname(pdev, "eth_wake_irq");
> -       if (priv->wol_irq == -ENXIO)
> +       if (priv->wol_irq < 0) {
> +               if (priv->wol_irq == -EPROBE_DEFER)
> +                       return -EPROBE_DEFER;
>                 priv->wol_irq = priv->dev->irq;
> +       }
>
>         priv->lpi_irq = platform_get_irq_byname(pdev, "eth_lpi");
> +       if (priv->lpi_irq < 0) {

You don't need this if.

> +               if (priv->wol_irq == -EPROBE_DEFER)

s/wol_irq/lpi_irq/

> +                       return -EPROBE_DEFER;
> +               priv->lpi_irq = -ENXIO;
> +       }
>
>         platform_set_drvdata(pdev, priv->dev);
>
> --
> 2.0.0.rc2
>
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