linux-kernel - [PATCH][next][V2] bpf: remove redundant assignment to err

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Message-Id: <20190604082146.2049-1-colin.king@canonical.com>
Date:   Tue,  4 Jun 2019 09:21:46 +0100
From:   Colin King <colin.king@...onical.com>
To:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Björn Töpel <bjorn.topel@...el.com>,
        Magnus Karlsson <magnus.karlsson@...el.com>,
        netdev@...r.kernel.org, xdp-newbies@...r.kernel.org,
        bpf@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][next][V2] bpf: remove redundant assignment to err

From: Colin Ian King <colin.king@...onical.com>

The variable err is assigned with the value -EINVAL that is never
read and it is re-assigned a new value later on.  The assignment is
redundant and can be removed.

Addresses-Coverity: ("Unused value")
Signed-off-by: Colin Ian King <colin.king@...onical.com>

---

V2: reorder variables as recommended by Jakub Kicinski to keep in
    the networking code style.

---
 kernel/bpf/devmap.c | 2 +-
 kernel/bpf/xskmap.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/bpf/devmap.c b/kernel/bpf/devmap.c
index 5ae7cce5ef16..b58a33ca8a27 100644
--- a/kernel/bpf/devmap.c
+++ b/kernel/bpf/devmap.c
@@ -88,8 +88,8 @@ static u64 dev_map_bitmap_size(const union bpf_attr *attr)
 static struct bpf_map *dev_map_alloc(union bpf_attr *attr)
 {
 	struct bpf_dtab *dtab;
-	int err = -EINVAL;
 	u64 cost;
+	int err;
 
 	if (!capable(CAP_NET_ADMIN))
 		return ERR_PTR(-EPERM);
diff --git a/kernel/bpf/xskmap.c b/kernel/bpf/xskmap.c
index 22066c28ba61..413d75f4fc72 100644
--- a/kernel/bpf/xskmap.c
+++ b/kernel/bpf/xskmap.c
@@ -17,8 +17,8 @@ struct xsk_map {
 
 static struct bpf_map *xsk_map_alloc(union bpf_attr *attr)
 {
-	int cpu, err = -EINVAL;
 	struct xsk_map *m;
+	int cpu, err;
 	u64 cost;
 
 	if (!capable(CAP_NET_ADMIN))
-- 
2.20.1