netdev - [PATCH net-next v2] netdevsim: remove return value check of debugfs_create

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Message-Id: <20171208053218.4536-1-bhole_prashant_q7@lab.ntt.co.jp>
Date:   Fri,  8 Dec 2017 14:32:18 +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 v2] netdevsim: remove return value check of debugfs_create_dir

Reason:
Discussion started about adding error check on return value where
it was not handled. Also handling the error using IS_ERR_OR_NULL
instead of IS_ERR(), because debugfs_create_dir() doesn't return
error. It returns NULL or a valid pointer when DebugFS is enabled.

Finally it was decided to remove error handling altogether to
make it consistent and removal of this check isn't fatal to the driver.

Signed-off-by: Prashant Bhole <bhole_prashant_q7@....ntt.co.jp>
---
 drivers/net/netdevsim/bpf.c    | 5 -----
 drivers/net/netdevsim/netdev.c | 2 --
 2 files changed, 7 deletions(-)

diff --git a/drivers/net/netdevsim/bpf.c b/drivers/net/netdevsim/bpf.c
index 078d2c37a6c1..03c09e8b99bd 100644
--- a/drivers/net/netdevsim/bpf.c
+++ b/drivers/net/netdevsim/bpf.c
@@ -214,11 +214,6 @@ static int nsim_bpf_create_prog(struct netdevsim *ns, struct bpf_prog *prog)
 	/* Program id is not populated yet when we create the state. */
 	sprintf(name, "%u", ns->prog_id_gen++);
 	state->ddir = debugfs_create_dir(name, ns->ddir_bpf_bound_progs);
-	if (IS_ERR(state->ddir)) {
-		err = PTR_ERR(state->ddir);
-		kfree(state);
-		return err;
-	}
 
 	debugfs_create_u32("id", 0400, state->ddir, &prog->aux->id);
 	debugfs_create_file("state", 0400, state->ddir,
diff --git a/drivers/net/netdevsim/netdev.c b/drivers/net/netdevsim/netdev.c
index eb8c679fca9f..6d4b35f26ae5 100644
--- a/drivers/net/netdevsim/netdev.c
+++ b/drivers/net/netdevsim/netdev.c
@@ -469,8 +469,6 @@ static int __init nsim_module_init(void)
 	int err;
 
 	nsim_ddir = debugfs_create_dir(DRV_NAME, NULL);
-	if (IS_ERR(nsim_ddir))
-		return PTR_ERR(nsim_ddir);
 
 	err = bus_register(&nsim_bus);
 	if (err)
-- 
2.13.6