add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/dio/dio.c
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@@ -110,6 +110,12 @@
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 #endif /* CONFIG_DIO_CONSTANTS */
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+static void dio_dev_release(struct device *dev)
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+{
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+	struct dio_dev *ddev = container_of(dev, typeof(struct dio_dev), dev);
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+	kfree(ddev);
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+}
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+
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 int __init dio_find(int deviceid)
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 {
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 	/* Called to find a DIO device before the full bus scan has run.
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@@ -224,6 +230,7 @@
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 		dev->bus = &dio_bus;
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 		dev->dev.parent = &dio_bus.dev;
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 		dev->dev.bus = &dio_bus_type;
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+		dev->dev.release = dio_dev_release;
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 		dev->scode = scode;
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 		dev->resource.start = pa;
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 		dev->resource.end = pa + DIO_SIZE(scode, va);
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@@ -251,6 +258,7 @@
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 		if (error) {
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 			pr_err("DIO: Error registering device %s\n",
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 			       dev->name);
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+			put_device(&dev->dev);
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 			continue;
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 		}
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 		error = dio_create_sysfs_dev_files(dev);