net: Remove usage of net_device last_rx member

The network stack no longer uses the last_rx member of struct net_device
since the bonding driver switched to use its own private last_rx in
commit 9f242738376d ("bonding: use last_arp_rx in slave_last_rx()").

However, some drivers still (ab)use the field for their own purposes and
some driver just update it without actually using it.

Previously, there was an accompanying comment for the last_rx member
added in commit 4dc89133f49b ("net: add a comment on netdev->last_rx")
which asked drivers not to update is, unless really needed. However,
this commend was removed in commit f8ff080dacec ("bonding: remove
useless updating of slave->dev->last_rx"), so some drivers added later
on still did update last_rx.

Remove all usage of last_rx and switch three drivers (sky2, atp and
smc91c92_cs) which actually read and write it to use their own private
copy in netdev_priv.

Compile-tested with allyesconfig and allmodconfig on x86 and arm.

Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Jay Vosburgh <j.vosburgh@gmail.com>
Cc: Veaceslav Falico <vfalico@gmail.com>
Cc: Andy Gospodarek <andy@greyhouse.net>
Cc: Mirko Lindner <mlindner@marvell.com>
Cc: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Acked-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Jay Vosburgh <jay.vosburgh@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 4 deletions

diff --git a/drivers/net/ethernet/realtek/atp.c b/drivers/net/ethernet/realtek/atp.c
index 570ed3bd3cbf..9bcd4aefc9c5 100644
--- a/drivers/net/ethernet/realtek/atp.c
+++ b/drivers/net/ethernet/realtek/atp.c
@@ -170,7 +170,7 @@ struct net_local {
     spinlock_t lock;
     struct net_device *next_module;
     struct timer_list timer;	/* Media selection timer. */
-    long last_rx_time;		/* Last Rx, in jiffies, to handle Rx hang. */
+    unsigned long last_rx_time;	/* Last Rx, in jiffies, to handle Rx hang. */
     int saved_tx_size;
     unsigned int tx_unit_busy:1;
     unsigned char re_tx,	/* Number of packet retransmissions. */
@@ -668,11 +668,11 @@ static irqreturn_t atp_interrupt(int irq, void *dev_instance)
 			}
 			num_tx_since_rx++;
 		} else if (num_tx_since_rx > 8 &&
-			   time_after(jiffies, dev->last_rx + HZ)) {
+			   time_after(jiffies, lp->last_rx_time + HZ)) {
 			if (net_debug > 2)
 				printk(KERN_DEBUG "%s: Missed packet? No Rx after %d Tx and "
 					   "%ld jiffies status %02x  CMR1 %02x.\n", dev->name,
-					   num_tx_since_rx, jiffies - dev->last_rx, status,
+					   num_tx_since_rx, jiffies - lp->last_rx_time, status,
 					   (read_nibble(ioaddr, CMR1) >> 3) & 15);
 			dev->stats.rx_missed_errors++;
 			hardware_init(dev);
@@ -789,7 +789,6 @@ static void net_rx(struct net_device *dev)
 		read_block(ioaddr, pkt_len, skb_put(skb,pkt_len), dev->if_port);
 		skb->protocol = eth_type_trans(skb, dev);
 		netif_rx(skb);
-		dev->last_rx = jiffies;
 		dev->stats.rx_packets++;
 		dev->stats.rx_bytes += pkt_len;
 	}