From: Parav Pandit <parav@mellanox.com>
Date: Wed, 17 Oct 2018 13:20:20 +0300
Subject: RDMA/core: Refactor ib_register_device() function
Patch-mainline: v4.20-rc1
Git-commit: 548cb4fbe80d68b9d1b8b30aca179636e74bec36
References: bsc#1103992 FATE#326009

ib_register_device() does several allocation and initialization
steps. Split it into smaller more readable functions for easy
review and maintenance.

Signed-off-by: Parav Pandit <parav@mellanox.com>
Reviewed-by: Daniel Jurgens <danielj@mellanox.com>
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/device.c |  126 +++++++++++++++++++++++----------------
 1 file changed, 75 insertions(+), 51 deletions(-)

--- a/drivers/infiniband/core/device.c
+++ b/drivers/infiniband/core/device.c
@@ -465,22 +465,8 @@ static u32 __dev_new_index(void)
 	}
 }
 
-/**
- * ib_register_device - Register an IB device with IB core
- * @device:Device to register
- *
- * Low-level drivers use ib_register_device() to register their
- * devices with the IB core.  All registered clients will receive a
- * callback for each device that is added. @device must be allocated
- * with ib_alloc_device().
- */
-int ib_register_device(struct ib_device *device, const char *name,
-		       int (*port_callback)(struct ib_device *, u8,
-					    struct kobject *))
+static void setup_dma_device(struct ib_device *device)
 {
-	int ret;
-	struct ib_client *client;
-	struct ib_udata uhw = {.outlen = 0, .inlen = 0};
 	struct device *parent = device->dev.parent;
 
 	WARN_ON_ONCE(device->dma_device);
@@ -512,34 +498,38 @@ int ib_register_device(struct ib_device
 		WARN_ON_ONCE(!parent);
 		device->dma_device = parent;
 	}
+}
 
-	mutex_lock(&device_mutex);
+static void cleanup_device(struct ib_device *device)
+{
+	ib_cache_cleanup_one(device);
+	ib_cache_release_one(device);
+	kfree(device->port_pkey_list);
+	kfree(device->port_immutable);
+}
 
-	if (strchr(name, '%')) {
-		ret = alloc_name(device, name);
-		if (ret)
-			goto out;
-	} else {
-		ret = dev_set_name(&device->dev, name);
-		if (ret)
-			goto out;
-	}
-	if (__ib_device_get_by_name(dev_name(&device->dev))) {
-		ret = -ENFILE;
-		goto out;
-	}
-	strlcpy(device->name, dev_name(&device->dev), IB_DEVICE_NAME_MAX);
+static int setup_device(struct ib_device *device)
+{
+	struct ib_udata uhw = {.outlen = 0, .inlen = 0};
+	int ret;
 
-	if (ib_device_check_mandatory(device)) {
-		ret = -EINVAL;
-		goto out;
-	}
+	ret = ib_device_check_mandatory(device);
+	if (ret)
+		return ret;
 
 	ret = read_port_immutable(device);
 	if (ret) {
 		dev_warn(&device->dev,
 			 "Couldn't create per port immutable data\n");
-		goto out;
+		return ret;
+	}
+
+	memset(&device->attrs, 0, sizeof(device->attrs));
+	ret = device->query_device(device, &device->attrs, &uhw);
+	if (ret) {
+		dev_warn(&device->dev,
+			 "Couldn't query the device attributes\n");
+		goto port_cleanup;
 	}
 
 	ret = setup_port_pkey_list(device);
@@ -554,6 +544,53 @@ int ib_register_device(struct ib_device
 			 "Couldn't set up InfiniBand P_Key/GID cache\n");
 		goto pkey_cleanup;
 	}
+	return 0;
+
+pkey_cleanup:
+	kfree(device->port_pkey_list);
+port_cleanup:
+	kfree(device->port_immutable);
+	return ret;
+}
+
+/**
+ * ib_register_device - Register an IB device with IB core
+ * @device:Device to register
+ *
+ * Low-level drivers use ib_register_device() to register their
+ * devices with the IB core.  All registered clients will receive a
+ * callback for each device that is added. @device must be allocated
+ * with ib_alloc_device().
+ */
+int ib_register_device(struct ib_device *device, const char *name,
+		       int (*port_callback)(struct ib_device *, u8,
+					    struct kobject *))
+{
+	int ret;
+	struct ib_client *client;
+
+	setup_dma_device(device);
+
+	mutex_lock(&device_mutex);
+
+	if (strchr(name, '%')) {
+		ret = alloc_name(device, name);
+		if (ret)
+			goto out;
+	} else {
+		ret = dev_set_name(&device->dev, name);
+		if (ret)
+			goto out;
+	}
+	if (__ib_device_get_by_name(dev_name(&device->dev))) {
+		ret = -ENFILE;
+		goto out;
+	}
+	strlcpy(device->name, dev_name(&device->dev), IB_DEVICE_NAME_MAX);
+
+	ret = setup_device(device);
+	if (ret)
+		goto out;
 
 	device->index = __dev_new_index();
 
@@ -561,15 +598,7 @@ int ib_register_device(struct ib_device
 	if (ret) {
 		dev_warn(&device->dev,
 			 "Couldn't register device with rdma cgroup\n");
-		goto cache_cleanup;
-	}
-
-	memset(&device->attrs, 0, sizeof(device->attrs));
-	ret = device->query_device(device, &device->attrs, &uhw);
-	if (ret) {
-		dev_warn(&device->dev,
-			 "Couldn't query the device attributes\n");
-		goto cg_cleanup;
+		goto dev_cleanup;
 	}
 
 	ret = ib_device_register_sysfs(device, port_callback);
@@ -593,13 +622,8 @@ int ib_register_device(struct ib_device
 
 cg_cleanup:
 	ib_device_unregister_rdmacg(device);
-cache_cleanup:
-	ib_cache_cleanup_one(device);
-	ib_cache_release_one(device);
-pkey_cleanup:
-	kfree(device->port_pkey_list);
-port_cleanup:
-	kfree(device->port_immutable);
+dev_cleanup:
+	cleanup_device(device);
 out:
 	mutex_unlock(&device_mutex);
 	return ret;