Re: [PATCH V3] soc: imx8m: Unregister cpufreq and soc dev in cleanup path

[Peng Fan <peng.fan@oss.nxp.com>]

Hi Shawn,

On Thu, Dec 19, 2024 at 10:50:29PM +0800, Peng Fan (OSS) wrote:
>From: Peng Fan <peng.fan@nxp.com>
>
>Unregister the cpufreq device and soc device when resource unwinding,
>otherwise there will be warning when do removing test:
>sysfs: cannot create duplicate filename '/devices/platform/imx-cpufreq-dt'
>CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.13.0-rc1-next-20241204
>Hardware name: NXP i.MX8MPlus EVK board (DT)
>
>Fixes: 9cc832d37799 ("soc: imx8m: Probe the SoC driver as platform driver")
>Cc: Marco Felsch <m.felsch@pengutronix.de>
>Signed-off-by: Peng Fan <peng.fan@nxp.com>
>---

Any comments?

Thanks,
Peng

>
>V3:
> Per Marco, drop remove function, use devm_add_action and update the patch
> title accordingly.
>
>V2:
> Add err check when create the cpufreq platform device
> https://lore.kernel.org/all/20241217015826.1374497-1-peng.fan@oss.nxp.com/
>
> drivers/soc/imx/soc-imx8m.c | 23 +++++++++++++++++++++--
> 1 file changed, 21 insertions(+), 2 deletions(-)
>
>diff --git a/drivers/soc/imx/soc-imx8m.c b/drivers/soc/imx/soc-imx8m.c
>index 8ac7658e3d52..585631b7ae44 100644
>--- a/drivers/soc/imx/soc-imx8m.c
>+++ b/drivers/soc/imx/soc-imx8m.c
>@@ -192,9 +192,20 @@ static __maybe_unused const struct of_device_id imx8_soc_match[] = {
> 	devm_kasprintf((dev), GFP_KERNEL, "%d.%d", ((soc_rev) >> 4) & 0xf, (soc_rev) & 0xf) : \
> 	"unknown"
> 
>+static void imx8m_unregister_soc(void *data)
>+{
>+	soc_device_unregister(data);
>+}
>+
>+static void imx8m_unregister_cpufreq(void *data)
>+{
>+	platform_device_unregister(data);
>+}
>+
> static int imx8m_soc_probe(struct platform_device *pdev)
> {
> 	struct soc_device_attribute *soc_dev_attr;
>+	struct platform_device *cpufreq_dev;
> 	const struct imx8_soc_data *data;
> 	struct device *dev = &pdev->dev;
> 	const struct of_device_id *id;
>@@ -239,11 +250,19 @@ static int imx8m_soc_probe(struct platform_device *pdev)
> 	if (IS_ERR(soc_dev))
> 		return PTR_ERR(soc_dev);
> 
>+	ret = devm_add_action(dev, imx8m_unregister_soc, soc_dev);
>+	if (ret)
>+		return ret;
>+
> 	pr_info("SoC: %s revision %s\n", soc_dev_attr->soc_id,
> 		soc_dev_attr->revision);
> 
>-	if (IS_ENABLED(CONFIG_ARM_IMX_CPUFREQ_DT))
>-		platform_device_register_simple("imx-cpufreq-dt", -1, NULL, 0);
>+	if (IS_ENABLED(CONFIG_ARM_IMX_CPUFREQ_DT)) {
>+		cpufreq_dev = platform_device_register_simple("imx-cpufreq-dt", -1, NULL, 0);
>+		ret = devm_add_action(dev, imx8m_unregister_cpufreq, cpufreq_dev);
>+		if (ret)
>+			return ret;
>+	}
> 
> 	return 0;
> }
>-- 
>2.37.1
>
>