This is a note to let you know that I've just added the patch titled
net: axienet: fix number of TX ring slots for available check
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-axienet-fix-number-of-tx-ring-slots-for-available-check.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From aba57a823d2985a2cc8c74a2535f3a88e68d9424 Mon Sep 17 00:00:00 2001
From: Robert Hancock <robert.hancock@xxxxxxxxxx>
Date: Tue, 18 Jan 2022 15:41:30 -0600
Subject: net: axienet: fix number of TX ring slots for available check
From: Robert Hancock <robert.hancock@xxxxxxxxxx>
commit aba57a823d2985a2cc8c74a2535f3a88e68d9424 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: 8a3b7a252dca9 ("drivers/net/ethernet/xilinx: added Xilinx AXI Ethernet driver")
Signed-off-by: Robert Hancock <robert.hancock@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/ethernet/xilinx/xilinx_axienet_main.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
+++ b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
@@ -681,7 +681,7 @@ axienet_start_xmit(struct sk_buff *skb,
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;
@@ -691,7 +691,7 @@ axienet_start_xmit(struct sk_buff *skb,
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);
Patches currently in stable-queue which might be from robert.hancock@xxxxxxxxxx are
queue-4.4/net-axienet-wait-for-phyrstcmplt-after-core-reset.patch
queue-4.4/net-axienet-fix-number-of-tx-ring-slots-for-available-check.patch
