add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/dio/dio.c
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@@ -89,8 +89,8 @@
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 #undef DIONAME
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 #undef DIOFBNAME
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-static const char *unknowndioname 
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-        = "unknown DIO board -- please email <linux-m68k@lists.linux-m68k.org>!";
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+static const char unknowndioname[]
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+	= "unknown DIO board, please email linux-m68k@lists.linux-m68k.org";
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 static const char *dio_getname(int id)
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 {
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@@ -109,6 +109,12 @@
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 #define dio_getname(_id)	(dio_no_name)
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 #endif /* CONFIG_DIO_CONSTANTS */
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+
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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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 int __init dio_find(int deviceid)
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 {
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@@ -135,7 +141,8 @@
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 		else
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 			va = ioremap(pa, PAGE_SIZE);
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-                if (probe_kernel_read(&i, (unsigned char *)va + DIO_IDOFF, 1)) {
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+		if (copy_from_kernel_nofault(&i,
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+				(unsigned char *)va + DIO_IDOFF, 1)) {
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 			if (scode >= DIOII_SCBASE)
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 				iounmap(va);
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                         continue;             /* no board present at that select code */
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@@ -208,7 +215,8 @@
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 		else
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 			va = ioremap(pa, PAGE_SIZE);
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-                if (probe_kernel_read(&i, (unsigned char *)va + DIO_IDOFF, 1)) {
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+		if (copy_from_kernel_nofault(&i,
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+				(unsigned char *)va + DIO_IDOFF, 1)) {
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 			if (scode >= DIOII_SCBASE)
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 				iounmap(va);
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                         continue;              /* no board present at that select code */
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@@ -222,6 +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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@@ -249,6 +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);