netdevsim: Change nsim_devlink_setup to return error to caller

Change nsim_devlink_setup to return any error back to the caller and
update nsim_init to handle it.

Requested-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Acked-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 15 insertions, 8 deletions

diff --git a/drivers/net/netdevsim/devlink.c b/drivers/net/netdevsim/devlink.c
index bbdcf064ba10..27ae05c5fdaf 100644
--- a/drivers/net/netdevsim/devlink.c
+++ b/drivers/net/netdevsim/devlink.c
@@ -218,22 +218,22 @@ void nsim_devlink_teardown(struct netdevsim *ns)
         }
 }
 
-void nsim_devlink_setup(struct netdevsim *ns)
+int nsim_devlink_setup(struct netdevsim *ns)
 {
         struct net *net = nsim_to_net(ns);
         bool *reg_devlink = net_generic(net, nsim_devlink_id);
         struct devlink *devlink;
-        int err = -ENOMEM;
+        int err;
 
         /* only one device per namespace controls devlink */
         if (!*reg_devlink) {
                 ns->devlink = NULL;
-                return;
+                return 0;
         }
 
         devlink = devlink_alloc(&nsim_devlink_ops, 0);
         if (!devlink)
-                return;
+                return -ENOMEM;
 
         err = devlink_register(devlink, &ns->dev);
         if (err)
@@ -247,12 +247,14 @@ void nsim_devlink_setup(struct netdevsim *ns)
 
         *reg_devlink = false;
 
-        return;
+        return 0;
 
 err_dl_unregister:
         devlink_unregister(devlink);
 err_devlink_free:
         devlink_free(devlink);
+
+        return err;
 }
 
 /* Initialize per network namespace state */
diff --git a/drivers/net/netdevsim/netdev.c b/drivers/net/netdevsim/netdev.c
index 8b30ab3ea2c2..ec68f38213d9 100644
--- a/drivers/net/netdevsim/netdev.c
+++ b/drivers/net/netdevsim/netdev.c
@@ -167,10 +167,14 @@ static int nsim_init(struct net_device *dev)
 
         SET_NETDEV_DEV(dev, &ns->dev);
 
-        nsim_devlink_setup(ns);
+        err = nsim_devlink_setup(ns);
+        if (err)
+                goto err_unreg_dev;
 
         return 0;
 
+err_unreg_dev:
+        device_unregister(&ns->dev);
 err_bpf_uninit:
         nsim_bpf_uninit(ns);
 err_debugfs_destroy:
diff --git a/drivers/net/netdevsim/netdevsim.h b/drivers/net/netdevsim/netdevsim.h
index afb8cf90c0fd..3a8581af3b85 100644
--- a/drivers/net/netdevsim/netdevsim.h
+++ b/drivers/net/netdevsim/netdevsim.h
@@ -117,7 +117,7 @@ enum nsim_resource_id {
         NSIM_RESOURCE_IPV6_FIB_RULES,
 };
 
-void nsim_devlink_setup(struct netdevsim *ns);
+int nsim_devlink_setup(struct netdevsim *ns);
 void nsim_devlink_teardown(struct netdevsim *ns);
 
 int nsim_devlink_init(void);
@@ -128,8 +128,9 @@ void nsim_fib_exit(void);
 u64 nsim_fib_get_val(struct net *net, enum nsim_resource_id res_id, bool max);
 int nsim_fib_set_max(struct net *net, enum nsim_resource_id res_id, u64 val);
 #else
-static inline void nsim_devlink_setup(struct netdevsim *ns)
+static inline int nsim_devlink_setup(struct netdevsim *ns)
 {
+        return 0;
 }
 
 static inline void nsim_devlink_teardown(struct netdevsim *ns)