netdevsim: drop code duplicated by a merge

Looks like the port adding loop makes a re-appearance on net-next
after net was merged back into it (even though it doesn't feature
in the merge diff).

The ports are already added in nsim_dev_create() so when we try
to add them again get EEXIST, and see:

netdevsim: probe of netdevsim0 failed with error -17

in the logs. When we remove the loop again the nsim_dev_probe()
and nsim_dev_remove() become a wrapper of nsim_dev_create() and
nsim_dev_destroy(). Remove this layer of indirection.

Fixes: d31e955 ("Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net")
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/netdevsim/dev.c

@@ -753,15 +753,15 @@ static int nsim_dev_reload_create(struct nsim_dev *nsim_dev,
 	return err;
 }
 
-static struct nsim_dev *nsim_dev_create(struct nsim_bus_dev *nsim_bus_dev)
+int nsim_dev_probe(struct nsim_bus_dev *nsim_bus_dev)
 {
 	struct nsim_dev *nsim_dev;
 	struct devlink *devlink;
 	int err;
 
 	devlink = devlink_alloc(&nsim_dev_devlink_ops, sizeof(*nsim_dev));
 	if (!devlink)
-		return ERR_PTR(-ENOMEM);
+		return -ENOMEM;
 	devlink_net_set(devlink, nsim_bus_dev->initial_net);
 	nsim_dev = devlink_priv(devlink);
 	nsim_dev->nsim_bus_dev = nsim_bus_dev;
@@ -773,6 +773,8 @@ static struct nsim_dev *nsim_dev_create(struct nsim_bus_dev *nsim_bus_dev)
 	nsim_dev->max_macs = NSIM_DEV_MAX_MACS_DEFAULT;
 	nsim_dev->test1 = NSIM_DEV_TEST1_DEFAULT;
 
+	dev_set_drvdata(&nsim_bus_dev->dev, nsim_dev);
+
 	err = nsim_dev_resources_register(devlink);
 	if (err)
 		goto err_devlink_free;
@@ -818,7 +820,7 @@ static struct nsim_dev *nsim_dev_create(struct nsim_bus_dev *nsim_bus_dev)
 		goto err_bpf_dev_exit;
 
 	devlink_params_publish(devlink);
-	return nsim_dev;
+	return 0;
 
 err_bpf_dev_exit:
 	nsim_bpf_dev_exit(nsim_dev);
@@ -841,7 +843,7 @@ static struct nsim_dev *nsim_dev_create(struct nsim_bus_dev *nsim_bus_dev)
 	devlink_resources_unregister(devlink, NULL);
 err_devlink_free:
 	devlink_free(devlink);
-	return ERR_PTR(err);
+	return err;
 }
 
 static void nsim_dev_reload_destroy(struct nsim_dev *nsim_dev)
@@ -858,8 +860,9 @@ static void nsim_dev_reload_destroy(struct nsim_dev *nsim_dev)
 	nsim_fib_destroy(devlink, nsim_dev->fib_data);
 }
 
-static void nsim_dev_destroy(struct nsim_dev *nsim_dev)
+void nsim_dev_remove(struct nsim_bus_dev *nsim_bus_dev)
 {
+	struct nsim_dev *nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev);
 	struct devlink *devlink = priv_to_devlink(nsim_dev);
 
 	nsim_dev_reload_destroy(nsim_dev);
@@ -873,40 +876,6 @@ static void nsim_dev_destroy(struct nsim_dev *nsim_dev)
 	devlink_free(devlink);
 }
 
-int nsim_dev_probe(struct nsim_bus_dev *nsim_bus_dev)
-{
-	struct nsim_dev *nsim_dev;
-	int i;
-	int err;
-
-	nsim_dev = nsim_dev_create(nsim_bus_dev);
-	if (IS_ERR(nsim_dev))
-		return PTR_ERR(nsim_dev);
-	dev_set_drvdata(&nsim_bus_dev->dev, nsim_dev);
-
-	mutex_lock(&nsim_dev->port_list_lock);
-	for (i = 0; i < nsim_bus_dev->port_count; i++) {
-		err = __nsim_dev_port_add(nsim_dev, i);
-		if (err)
-			goto err_port_del_all;
-	}
-	mutex_unlock(&nsim_dev->port_list_lock);
-	return 0;
-
-err_port_del_all:
-	mutex_unlock(&nsim_dev->port_list_lock);
-	nsim_dev_port_del_all(nsim_dev);
-	nsim_dev_destroy(nsim_dev);
-	return err;
-}
-
-void nsim_dev_remove(struct nsim_bus_dev *nsim_bus_dev)
-{
-	struct nsim_dev *nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev);
-
-	nsim_dev_destroy(nsim_dev);
-}
-
 static struct nsim_dev_port *
 __nsim_dev_port_lookup(struct nsim_dev *nsim_dev, unsigned int port_index)
 {