Just as the initial check, we need to ensure num_frag+1 buffers available,
as that is the number of buffers we are going to use.
This fixes a buffer overflow, which might be seen during heavy network
load. Complete lockup of TEMAC was reproducible within about 10 minutes of
a particular load.
Fixes: 84823ff80f74 ("net: ll_temac: Fix race condition causing TX hang")
Cc: stable@xxxxxxxxxxxxxxx # v5.4+
Signed-off-by: Esben Haabendal <esben@xxxxxxxxxx>
---
drivers/net/ethernet/xilinx/ll_temac_main.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/xilinx/ll_temac_main.c b/drivers/net/ethernet/xilinx/ll_temac_main.c
index 9797aa3221d1..cc482ee36501 100644
--- a/drivers/net/ethernet/xilinx/ll_temac_main.c
+++ b/drivers/net/ethernet/xilinx/ll_temac_main.c
@@ -861,7 +861,7 @@ temac_start_xmit(struct sk_buff *skb, struct net_device *ndev)
smp_mb();
/* Space might have just been freed - check again */
- if (temac_check_tx_bd_space(lp, num_frag))
+ if (temac_check_tx_bd_space(lp, num_frag + 1))
return NETDEV_TX_BUSY;
netif_wake_queue(ndev);
--
2.32.0
