netdev - [PATCH net-next 1/7] drivers: net: smc91x: Fix set but unused W=1 warning

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Date:   Sat, 31 Oct 2020 01:49:52 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     netdev <netdev@...r.kernel.org>, Nicolas Pitre <nico@...xnic.net>,
        Andrew Lunn <andrew@...n.ch>
Subject: [PATCH net-next 1/7] drivers: net: smc91x: Fix set but unused W=1 warning

drivers/net/ethernet/smsc/smc91x.c:706:51: warning: variable ‘pkt_len’ set but not used [-Wunused-but-set-variable]
  706 |  unsigned int saved_packet, packet_no, tx_status, pkt_len;

Add a new macro for getting fields out of the header, which only gets
the status, not the length which in this case is not needed.

Signed-off-by: Andrew Lunn <andrew@...n.ch>
---
 drivers/net/ethernet/smsc/smc91x.c |  4 ++--
 drivers/net/ethernet/smsc/smc91x.h | 10 ++++++++++
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/smsc/smc91x.c b/drivers/net/ethernet/smsc/smc91x.c
index f6b73afd1879..61333939a73e 100644
--- a/drivers/net/ethernet/smsc/smc91x.c
+++ b/drivers/net/ethernet/smsc/smc91x.c
@@ -703,7 +703,7 @@ static void smc_tx(struct net_device *dev)
 {
 	struct smc_local *lp = netdev_priv(dev);
 	void __iomem *ioaddr = lp->base;
-	unsigned int saved_packet, packet_no, tx_status, pkt_len;
+	unsigned int saved_packet, packet_no, tx_status;
 
 	DBG(3, dev, "%s\n", __func__);
 
@@ -720,7 +720,7 @@ static void smc_tx(struct net_device *dev)
 
 	/* read the first word (status word) from this packet */
 	SMC_SET_PTR(lp, PTR_AUTOINC | PTR_READ);
-	SMC_GET_PKT_HDR(lp, tx_status, pkt_len);
+	SMC_GET_PKT_HDR_STATUS(lp, tx_status);
 	DBG(2, dev, "TX STATUS 0x%04x PNR 0x%02x\n",
 	    tx_status, packet_no);
 
diff --git a/drivers/net/ethernet/smsc/smc91x.h b/drivers/net/ethernet/smsc/smc91x.h
index 387539a8094b..705d9d6ebaa5 100644
--- a/drivers/net/ethernet/smsc/smc91x.h
+++ b/drivers/net/ethernet/smsc/smc91x.h
@@ -1056,6 +1056,16 @@ static const char * chip_ids[ 16 ] =  {
 		}							\
 	} while (0)
 
+#define SMC_GET_PKT_HDR_STATUS(lp, status)				\
+	do {								\
+		if (SMC_32BIT(lp)) {					\
+			unsigned int __val = SMC_inl(ioaddr, DATA_REG(lp)); \
+			(status) = __val & 0xffff;			\
+		} else {						\
+			(status) = SMC_inw(ioaddr, DATA_REG(lp));	\
+		}							\
+	} while (0)
+
 #define SMC_PUSH_DATA(lp, p, l)					\
 	do {								\
 		if (SMC_32BIT(lp)) {				\
-- 
2.28.0