linux-kernel - Re: [PATCHv6 5/5] hwspinlock/omap: add support for dt nodes

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Date:	Wed, 12 Nov 2014 21:14:44 +0200
From:	Ohad Ben-Cohen <ohad@...ery.com>
To:	Suman Anna <s-anna@...com>
Cc:	Mark Rutland <mark.rutland@....com>,
	Kumar Gala <galak@...eaurora.org>,
	Tony Lindgren <tony@...mide.com>,
	Josh Cartwright <joshc@...eaurora.org>,
	Bjorn Andersson <bjorn@...o.se>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	linux-arm <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCHv6 5/5] hwspinlock/omap: add support for dt nodes

Hi Suman,

On Fri, Sep 12, 2014 at 11:24 PM, Suman Anna <s-anna@...com> wrote:
>  static int omap_hwspinlock_probe(struct platform_device *pdev)
>  {
> -       struct hwspinlock_pdata *pdata = pdev->dev.platform_data;
> +       struct device_node *node = pdev->dev.of_node;
>         struct hwspinlock_device *bank;
>         struct hwspinlock *hwlock;
>         struct resource *res;
>         void __iomem *io_base;
> -       int num_locks, i, ret;
> +       int num_locks, i, ret, base_id;
>
> -       if (!pdata)
> +       if (!node)
>                 return -ENODEV;
>
> +       ret = of_hwspin_lock_get_base_id(node);
> +       if (ret < 0 && ret != -EINVAL)
> +               return -ENODEV;
> +       base_id = (ret > 0 ? ret : 0);

Does this mean you allow nodes not to have the base_id property? How
do we protect against multiple nodes not having a base_id property
then?

Implicitly assuming a base_id value (zero in this case) may not be always safe.

Thanks,
Ohad.
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