Auto-update from upstream

1 files changed, 53 insertions, 0 deletions

diff --git a/drivers/s390/s390_rdev.c b/drivers/s390/s390_rdev.c
new file mode 100644
index 00000000000..566cc3d185b
--- /dev/null
+++ b/drivers/s390/s390_rdev.c
@@ -0,0 +1,53 @@
+/*
+ *  drivers/s390/s390_rdev.c
+ *  s390 root device
+ *   $Revision: 1.2 $
+ *
+ *    Copyright (C) 2002, 2005 IBM Deutschland Entwicklung GmbH,
+ *			 IBM Corporation
+ *    Author(s): Cornelia Huck (cohuck@de.ibm.com)
+ *		  Carsten Otte  (cotte@de.ibm.com)
+ */
+
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/device.h>
+#include <asm/s390_rdev.h>
+
+static void
+s390_root_dev_release(struct device *dev)
+{
+	kfree(dev);
+}
+
+struct device *
+s390_root_dev_register(const char *name)
+{
+	struct device *dev;
+	int ret;
+
+	if (!strlen(name))
+		return ERR_PTR(-EINVAL);
+	dev = kmalloc(sizeof(struct device), GFP_KERNEL);
+	if (!dev)
+		return ERR_PTR(-ENOMEM);
+	memset(dev, 0, sizeof(struct device));
+	strncpy(dev->bus_id, name, min(strlen(name), (size_t)BUS_ID_SIZE));
+	dev->release = s390_root_dev_release;
+	ret = device_register(dev);
+	if (ret) {
+		kfree(dev);
+		return ERR_PTR(ret);
+	}
+	return dev;
+}
+
+void
+s390_root_dev_unregister(struct device *dev)
+{
+	if (dev)
+		device_unregister(dev);
+}
+
+EXPORT_SYMBOL(s390_root_dev_register);
+EXPORT_SYMBOL(s390_root_dev_unregister);