linux-kernel - [PATCH] net/packet: Remove redundant assignment to ret

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Message-Id: <1621246525-65683-1-git-send-email-jiapeng.chong@linux.alibaba.com>
Date:   Mon, 17 May 2021 18:15:25 +0800
From:   Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
To:     davem@...emloft.net
Cc:     kuba@...nel.org, ast@...nel.org, daniel@...earbox.net,
        andrii@...nel.org, kafai@...com, songliubraving@...com, yhs@...com,
        john.fastabend@...il.com, kpsingh@...nel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        bpf@...r.kernel.org,
        Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
Subject: [PATCH] net/packet: Remove redundant assignment to ret

Variable ret is set to '0' or '-EBUSY', but this value is never read
as it is not used later on, hence it is a redundant assignment and
can be removed.

Clean up the following clang-analyzer warning:

net/packet/af_packet.c:3936:4: warning: Value stored to 'ret' is never
read [clang-analyzer-deadcode.DeadStores].

net/packet/af_packet.c:3933:4: warning: Value stored to 'ret' is never
read [clang-analyzer-deadcode.DeadStores].

No functional change.

Reported-by: Abaci Robot <abaci@...ux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
---
 net/packet/af_packet.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index ae906eb..71dd6b9 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -3929,12 +3929,9 @@ static void packet_flush_mclist(struct sock *sk)
 			return -EFAULT;
 
 		lock_sock(sk);
-		if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) {
-			ret = -EBUSY;
-		} else {
+		if (!po->rx_ring.pg_vec && !po->tx_ring.pg_vec)
 			po->tp_tx_has_off = !!val;
-			ret = 0;
-		}
+
 		release_sock(sk);
 		return 0;
 	}
-- 
1.8.3.1