Re: [PATCH v6 6/8] coresight: add support for CPU debug module

[Leo Yan]

Hi Suzuki,

On Wed, Apr 19, 2017 at 02:23:04PM +0100, Suzuki K Poulose wrote:
> Hi Leo,
> 
> This version looks good to me. I have two minor comments below.

Thanks for reviewing. Will take the suggestions. Just check a bit for
last comment.

[...]

> >+static int debug_probe(struct amba_device *adev, const struct amba_id *id)
> >+{
> >+	void __iomem *base;
> >+	struct device *dev = &adev->dev;
> >+	struct debug_drvdata *drvdata;
> >+	struct resource *res = &adev->res;
> >+	struct device_node *np = adev->dev.of_node;
> >+	int ret;
> >+
> >+	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
> >+	if (!drvdata)
> >+		return -ENOMEM;
> >+
> >+	drvdata->cpu = np ? of_coresight_get_cpu(np) : 0;
> >+	if (per_cpu(debug_drvdata, drvdata->cpu)) {
> >+		dev_err(dev, "CPU%d drvdata has been initialized\n",
> >+			drvdata->cpu);
> 
> May be we could warn about a possible issue in the DT ?

So can I understand the suggestion is to add warning in function
of_coresight_get_cpu() when cannot find CPU number, and here directly
bail out?

Thanks,
Leo Yan