From: Guenter Roeck <linux@roeck-us.net>
To: Jamal Hadi Salim <jhs@mojatatu.com>
Cc: Cong Wang <xiyou.wangcong@gmail.com>,
Jiri Pirko <jiri@resnulli.us>,
"David S . Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
Guenter Roeck <linux@roeck-us.net>
Subject: [PATCH] net/sched: taprio: Drop unnecessary NULL check after container_of
Date: Tue, 11 May 2021 13:54:49 -0700 [thread overview]
Message-ID: <20210511205449.1676407-1-linux@roeck-us.net> (raw)
The rcu_head pointer passed to taprio_free_sched_cb is never NULL.
That means that the result of container_of() operations on it is also
never NULL, even though rcu_head is the first element of the structure
embedding it. On top of that, it is misleading to perform a NULL check
on the result of container_of() because the position of the contained
element could change, which would make the check invalid. Remove the
unnecessary NULL check.
This change was made automatically with the following Coccinelle script.
@@
type t;
identifier v;
statement s;
@@
<+...
(
t v = container_of(...);
|
v = container_of(...);
)
...
when != v
- if (\( !v \| v == NULL \) ) s
...+>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
net/sched/sch_taprio.c | 3 ---
1 file changed, 3 deletions(-)
diff --git a/net/sched/sch_taprio.c b/net/sched/sch_taprio.c
index 5c91df52b8c2..71e8a7a84841 100644
--- a/net/sched/sch_taprio.c
+++ b/net/sched/sch_taprio.c
@@ -114,9 +114,6 @@ static void taprio_free_sched_cb(struct rcu_head *head)
struct sched_gate_list *sched = container_of(head, struct sched_gate_list, rcu);
struct sched_entry *entry, *n;
- if (!sched)
- return;
-
list_for_each_entry_safe(entry, n, &sched->entries, list) {
list_del(&entry->list);
kfree(entry);
--
2.25.1
next reply other threads:[~2021-05-11 20:54 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-11 20:54 Guenter Roeck [this message]
2021-05-11 23:33 ` [PATCH] net/sched: taprio: Drop unnecessary NULL check after container_of patchwork-bot+netdevbpf
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