netdev - [PATCH net-next] netdevsim: check return value of debugfs_create

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Date:   Thu,  7 Dec 2017 10:02:13 +0900
From:   Prashant Bhole <bhole_prashant_q7@....ntt.co.jp>
To:     "David S . Miller" <davem@...emloft.net>
Cc:     Prashant Bhole <bhole_prashant_q7@....ntt.co.jp>,
        netdev@...r.kernel.org,
        Jakub Kicinski <jakub.kicinski@...ronome.com>
Subject: [PATCH net-next] netdevsim: check return value of debugfs_create_dir

- Handled debugfs_create_dir failure in nsim_init()
- Fixed return value of nsim_module_init() when debugfs_create_dir fails

Signed-off-by: Prashant Bhole <bhole_prashant_q7@....ntt.co.jp>
---
 drivers/net/netdevsim/netdev.c | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/drivers/net/netdevsim/netdev.c b/drivers/net/netdevsim/netdev.c
index eb8c679fca9f..6c4e08f46bcb 100644
--- a/drivers/net/netdevsim/netdev.c
+++ b/drivers/net/netdevsim/netdev.c
@@ -147,10 +147,15 @@ struct device_type nsim_dev_type = {
 static int nsim_init(struct net_device *dev)
 {
 	struct netdevsim *ns = netdev_priv(dev);
-	int err;
+	int err = -ENOMEM;
 
 	ns->netdev = dev;
 	ns->ddir = debugfs_create_dir(netdev_name(dev), nsim_ddir);
+	if (IS_ERR_OR_NULL(ns->ddir)) {
+		if (ns->ddir)
+			err = PTR_ERR(ns->ddir);
+		goto err;
+	}
 
 	err = nsim_bpf_init(ns);
 	if (err)
@@ -171,6 +176,7 @@ static int nsim_init(struct net_device *dev)
 	nsim_bpf_uninit(ns);
 err_debugfs_destroy:
 	debugfs_remove_recursive(ns->ddir);
+err:
 	return err;
 }
 
@@ -466,11 +472,14 @@ struct dentry *nsim_ddir;
 
 static int __init nsim_module_init(void)
 {
-	int err;
+	int err = -ENOMEM;
 
 	nsim_ddir = debugfs_create_dir(DRV_NAME, NULL);
-	if (IS_ERR(nsim_ddir))
-		return PTR_ERR(nsim_ddir);
+	if (IS_ERR_OR_NULL(nsim_ddir)) {
+		if (nsim_ddir)
+			err = PTR_ERR(nsim_ddir);
+		goto err;
+	}
 
 	err = bus_register(&nsim_bus);
 	if (err)
@@ -486,6 +495,7 @@ static int __init nsim_module_init(void)
 	bus_unregister(&nsim_bus);
 err_debugfs_destroy:
 	debugfs_remove_recursive(nsim_ddir);
+err:
 	return err;
 }
 
-- 
2.13.6