From: Leon Romanovsky <leonro@mellanox.com>
Date: Wed, 10 Oct 2018 09:19:11 +0300
Subject: RDMA/core: Implement IB device rename function
Patch-mainline: v4.20-rc1
Git-commit: d21943dd19b5c79dc09bb0e8bf80cd5ee09c41c2
References: bsc#1103992 FATE#326009

Generic implementation of IB device rename function.

Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/infiniband/core/core_priv.h |    1 +
 drivers/infiniband/core/device.c    |   25 +++++++++++++++++++++++++
 2 files changed, 26 insertions(+)

--- a/drivers/infiniband/core/core_priv.h
+++ b/drivers/infiniband/core/core_priv.h
@@ -87,6 +87,7 @@ int  ib_device_register_sysfs(struct ib_
 			      int (*port_callback)(struct ib_device *,
 						   u8, struct kobject *));
 void ib_device_unregister_sysfs(struct ib_device *device);
+int ib_device_rename(struct ib_device *ibdev, const char *name);
 
 typedef void (*roce_netdev_callback)(struct ib_device *device, u8 port,
 	      struct net_device *idev, void *cookie);
--- a/drivers/infiniband/core/device.c
+++ b/drivers/infiniband/core/device.c
@@ -171,6 +171,31 @@ static struct ib_device *__ib_device_get
 	return NULL;
 }
 
+int ib_device_rename(struct ib_device *ibdev, const char *name)
+{
+	struct ib_device *device;
+	int ret = 0;
+
+	if (!strcmp(name, dev_name(&ibdev->dev)))
+		return ret;
+
+	mutex_lock(&device_mutex);
+	list_for_each_entry(device, &device_list, core_list) {
+		if (!strcmp(name, dev_name(&device->dev))) {
+			ret = -EEXIST;
+			goto out;
+		}
+	}
+
+	ret = device_rename(&ibdev->dev, name);
+	if (ret)
+		goto out;
+	strlcpy(ibdev->name, name, IB_DEVICE_NAME_MAX);
+out:
+	mutex_unlock(&device_mutex);
+	return ret;
+}
+
 static int alloc_name(struct ib_device *ibdev, const char *name)
 {
 	unsigned long *inuse;