linux-kernel - Re: [TEGRA194_CPUFREQ PATCH v4 3/4] cpufreq: Add Tegra194 cpufreq driver

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Date:   Mon, 29 Jun 2020 11:46:39 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Sumit Gupta <sumitg@...dia.com>
Cc:     rjw@...ysocki.net, catalin.marinas@....com, will@...nel.org,
        thierry.reding@...il.com, robh+dt@...nel.org,
        devicetree@...r.kernel.org, jonathanh@...dia.com, talho@...dia.com,
        linux-pm@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        bbasu@...dia.com, mperttunen@...dia.com
Subject: Re: [TEGRA194_CPUFREQ PATCH v4 3/4] cpufreq: Add Tegra194 cpufreq
 driver

On 26-06-20, 21:13, Sumit Gupta wrote:
> +static int tegra194_cpufreq_probe(struct platform_device *pdev)
> +{
> +	struct tegra194_cpufreq_data *data;
> +	struct tegra_bpmp *bpmp;
> +	int err, i;
> +
> +	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
> +	if (!data)
> +		return -ENOMEM;
> +
> +	data->num_clusters = MAX_CLUSTERS;
> +	data->tables = devm_kcalloc(&pdev->dev, data->num_clusters,
> +				    sizeof(*data->tables), GFP_KERNEL);
> +	if (!data->tables)
> +		return -ENOMEM;
> +
> +	platform_set_drvdata(pdev, data);
> +
> +	bpmp = tegra_bpmp_get(&pdev->dev);
> +	if (IS_ERR(bpmp))
> +		return PTR_ERR(bpmp);
> +
> +	read_counters_wq = alloc_workqueue("read_counters_wq", __WQ_LEGACY, 1);
> +	if (!read_counters_wq) {
> +		dev_err(&pdev->dev, "fail to create_workqueue\n");
> +		err = -EINVAL;
> +		goto put_bpmp;

This will call destroy_workqueue() eventually and it will crash your
kernel.

Apart from this, this stuff looks okay. Don't resend the patch just
yet (and if required, send only this patch using --in-reply-to flag
for git send email). Lets wait for an Ack from Rob for the first two
patches.

> +	}
> +

-- 
viresh