netdev - [PATCH] net: macb: Remove redundant assignment to w0 and queue

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Date:   Wed, 28 Apr 2021 18:03:08 +0800
From:   Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
To:     nicolas.ferre@...rochip.com
Cc:     claudiu.beznea@...rochip.com, davem@...emloft.net, kuba@...nel.org,
        linux@...linux.org.uk, palmer@...belt.com,
        paul.walmsley@...ive.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
        Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
Subject: [PATCH] net: macb: Remove redundant assignment to w0 and queue

Variable w0 and queue is set to zero and bp->queues but these
values is not used as it is overwritten later on, hence
redundant assignment  can be removed.

Cleans up the following clang-analyzer warning:

drivers/net/ethernet/cadence/macb_main.c:4919:21: warning: Value stored
to 'queue' during its initialization is never read
[clang-analyzer-deadcode.DeadStores].

drivers/net/ethernet/cadence/macb_main.c:4832:21: warning: Value stored
to 'queue' during its initialization is never read
[clang-analyzer-deadcode.DeadStores].

drivers/net/ethernet/cadence/macb_main.c:3265:3: warning: Value stored
to 'w0' is never read [clang-analyzer-deadcode.DeadStores].

drivers/net/ethernet/cadence/macb_main.c:3251:3: warning: Value stored
to 'w0' is never read [clang-analyzer-deadcode.DeadStores].

Reported-by: Abaci Robot <abaci@...ux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>
---
 drivers/net/ethernet/cadence/macb_main.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
index 0f6a6cb..5f1dbc2 100644
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -3248,7 +3248,6 @@ static void gem_prog_cmp_regs(struct macb *bp, struct ethtool_rx_flow_spec *fs)
 	/* ignore field if any masking set */
 	if (tp4sp_m->ip4src == 0xFFFFFFFF) {
 		/* 1st compare reg - IP source address */
-		w0 = 0;
 		w1 = 0;
 		w0 = tp4sp_v->ip4src;
 		w1 = GEM_BFINS(T2DISMSK, 1, w1); /* 32-bit compare */
@@ -3262,7 +3261,6 @@ static void gem_prog_cmp_regs(struct macb *bp, struct ethtool_rx_flow_spec *fs)
 	/* ignore field if any masking set */
 	if (tp4sp_m->ip4dst == 0xFFFFFFFF) {
 		/* 2nd compare reg - IP destination address */
-		w0 = 0;
 		w1 = 0;
 		w0 = tp4sp_v->ip4dst;
 		w1 = GEM_BFINS(T2DISMSK, 1, w1); /* 32-bit compare */
@@ -4829,7 +4827,7 @@ static int __maybe_unused macb_suspend(struct device *dev)
 {
 	struct net_device *netdev = dev_get_drvdata(dev);
 	struct macb *bp = netdev_priv(netdev);
-	struct macb_queue *queue = bp->queues;
+	struct macb_queue *queue;
 	unsigned long flags;
 	unsigned int q;
 	int err;
@@ -4916,7 +4914,7 @@ static int __maybe_unused macb_resume(struct device *dev)
 {
 	struct net_device *netdev = dev_get_drvdata(dev);
 	struct macb *bp = netdev_priv(netdev);
-	struct macb_queue *queue = bp->queues;
+	struct macb_queue *queue;
 	unsigned long flags;
 	unsigned int q;
 	int err;
-- 
1.8.3.1