net: ll_temac: Fix bug causing buffer descriptor overrun

As we are actually using a BD for both the skb and each frag contained in it, the oldest TX BD would be overwritten when there was exactly one BD less than needed. Signed-off-by: Esben Haabendal <[email protected]> Signed-off-by: David S. Miller <[email protected]>
jb55 · May 1, 2019 · 2c9938e · 2c9938e
1 parent a8c9bd3
commit 2c9938e
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/drivers/net/ethernet/xilinx/ll_temac_main.c b/drivers/net/ethernet/xilinx/ll_temac_main.c
@@ -743,7 +743,7 @@ temac_start_xmit(struct sk_buff *skb, struct net_device *ndev)
 	start_p = lp->tx_bd_p + sizeof(*lp->tx_bd_v) * lp->tx_bd_tail;
 	cur_p = &lp->tx_bd_v[lp->tx_bd_tail];
 
-	if (temac_check_tx_bd_space(lp, num_frag)) {
+	if (temac_check_tx_bd_space(lp, num_frag + 1)) {
 		if (!netif_queue_stopped(ndev))
 			netif_stop_queue(ndev);
 		return NETDEV_TX_BUSY;