netdev - Re: [PATCH v2 07/22] soc/fsl/bman_portals: defer probe after bman's probe

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Date:   Thu, 27 Sep 2018 15:40:02 -0500
From:   Li Yang <leoyang.li@....com>
To:     Laurentiu Tudor <laurentiu.tudor@....com>
Cc:     "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, Netdev <netdev@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        Roy Pledge <roy.pledge@....com>, madalin.bucur@....com,
        David Miller <davem@...emloft.net>,
        Shawn Guo <shawnguo@...nel.org>, robin.murphy@....com,
        bharat.bhushan@....com
Subject: Re: [PATCH v2 07/22] soc/fsl/bman_portals: defer probe after bman's probe

On Wed, Sep 26, 2018 at 8:26 AM <laurentiu.tudor@....com> wrote:
>
> From: Laurentiu Tudor <laurentiu.tudor@....com>
>
> A crash in bman portal probing could not be triggered (as is the case
> with qman portals) but it does make calls [1] into the bman driver so
> lets make sure the bman portal probing happens after bman's.
>
> [1]  bman_p_irqsource_add() (in bman) called by:
>        init_pcfg() called by:
>          bman_portal_probe()
>
> Signed-off-by: Laurentiu Tudor <laurentiu.tudor@....com>

As this is part of a bug fix for v4.19, applied on soc/fsl for fix.

> ---
>  drivers/soc/fsl/qbman/bman_portal.c | 10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/soc/fsl/qbman/bman_portal.c b/drivers/soc/fsl/qbman/bman_portal.c
> index 2f71f7df3465..f9edd28894fd 100644
> --- a/drivers/soc/fsl/qbman/bman_portal.c
> +++ b/drivers/soc/fsl/qbman/bman_portal.c
> @@ -91,7 +91,15 @@ static int bman_portal_probe(struct platform_device *pdev)
>         struct device_node *node = dev->of_node;
>         struct bm_portal_config *pcfg;
>         struct resource *addr_phys[2];
> -       int irq, cpu;
> +       int irq, cpu, err;
> +
> +       err = bman_is_probed();
> +       if (!err)
> +               return -EPROBE_DEFER;
> +       if (err < 0) {
> +               dev_err(&pdev->dev, "failing probe due to bman probe error\n");
> +               return -ENODEV;
> +       }
>
>         pcfg = devm_kmalloc(dev, sizeof(*pcfg), GFP_KERNEL);
>         if (!pcfg)
> --
> 2.17.1
>