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net: axienet: fix number of TX ring slots for available check

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commit aba57a823d upstream.

The check for the number of available TX ring slots was off by 1 since a
slot is required for the skb header as well as each fragment. This could
result in overwriting a TX ring slot that was still in use.

Fixes: 8a3b7a252d ("drivers/net/ethernet/xilinx: added Xilinx AXI Ethernet driver")
Signed-off-by: Robert Hancock <robert.hancock@calian.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Robert Hancock 2022-01-18 15:41:30 -06:00 committed by Greg Kroah-Hartman
parent 8b8ad8a7ac
commit 86eb4b2247
1 changed files with 2 additions and 2 deletions
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4
drivers/net/ethernet/xilinx/xilinx_axienet_main.c
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@ -682,7 +682,7 @@ axienet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
num_frag = skb_shinfo(skb)->nr_frags;
cur_p = &lp->tx_bd_v[lp->tx_bd_tail];
if (axienet_check_tx_bd_space(lp, num_frag)) {
if (axienet_check_tx_bd_space(lp, num_frag + 1)) {
if (netif_queue_stopped(ndev))
return NETDEV_TX_BUSY;
@ -692,7 +692,7 @@ axienet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
smp_mb();
/* Space might have just been freed - check again */
if (axienet_check_tx_bd_space(lp, num_frag))
if (axienet_check_tx_bd_space(lp, num_frag + 1))
return NETDEV_TX_BUSY;
netif_wake_queue(ndev);