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;

The read of the packet length in the descriptor probably needs to be
kept in order to keep the hardware happy. So tell the compiler we
don't expect to use the value by using the __always_unused attribute.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/smsc/smc91x.c b/drivers/net/ethernet/smsc/smc91x.c
index f6b73afd1879a4aa33ece5e35d2466fff6b1a012..c8dabeaab4fcaf326c38e17ec03bdc6ece603779 100644 (file)
--- a/drivers/net/ethernet/smsc/smc91x.c
+++ b/drivers/net/ethernet/smsc/smc91x.c
@@ -703,7 +703,8 @@ 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;
+       unsigned int pkt_len __always_unused;
 
        DBG(3, dev, "%s\n", __func__);