linux-kernel - [PATCH][next] xirc2ps_cs: remove redundant assignment to variable okay, clean up freespace

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Date: Mon,  5 Feb 2024 21:36:43 +0000
From: Colin Ian King <colin.i.king@...il.com>
To: "David S . Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org
Cc: kernel-janitors@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH][next] xirc2ps_cs: remove redundant assignment to variable okay, clean up freespace

The variable okay is being initialized with a value that is never
read, it is being re-assigned later on. The initialization is
redundant and can be removed.  Also clean up assignment to
variable freespace using an assignment and mask operation.

Cleans up clang scan build warning:
drivers/net/ethernet/xircom/xirc2ps_cs.c:1244:5: warning: Value stored
to 'okay' is never read [deadcode.DeadStores]

Signed-off-by: Colin Ian King <colin.i.king@...il.com>
---
 drivers/net/ethernet/xircom/xirc2ps_cs.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/xircom/xirc2ps_cs.c b/drivers/net/ethernet/xircom/xirc2ps_cs.c
index 9f505cf02d96..e9bc38fd2025 100644
--- a/drivers/net/ethernet/xircom/xirc2ps_cs.c
+++ b/drivers/net/ethernet/xircom/xirc2ps_cs.c
@@ -1240,9 +1240,7 @@ do_start_xmit(struct sk_buff *skb, struct net_device *dev)
     netif_stop_queue(dev);
     SelectPage(0);
     PutWord(XIRCREG0_TRS, (u_short)pktlen+2);
-    freespace = GetWord(XIRCREG0_TSO);
-    okay = freespace & 0x8000;
-    freespace &= 0x7fff;
+    freespace = GetWord(XIRCREG0_TSO) & 0x7fff;
     /* TRS doesn't work - (indeed it is eliminated with sil-rev 1) */
     okay = pktlen +2 < freespace;
     pr_debug("%s: avail. tx space=%u%s\n",
-- 
2.39.2