5.15-stable review patch. If anyone has any objections, please let me know.
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From: Ronald Wahl ronald.wahl@raritan.com
commit 7a99afef17af66c276c1d6e6f4dbcac223eaf6ac upstream.
The amount of TX space in the hardware buffer is tracked in the tx_space variable. The initial value is currently only set during driver probing.
After closing the interface and reopening it the tx_space variable has the last value it had before close. If it is smaller than the size of the first send packet after reopeing the interface the queue will be stopped. The queue is woken up after receiving a TX interrupt but this will never happen since we did not send anything.
This commit moves the initialization of the tx_space variable to the ks8851_net_open function right before starting the TX queue. Also query the value from the hardware instead of using a hard coded value.
Only the SPI chip variant is affected by this issue because only this driver variant actually depends on the tx_space variable in the xmit function.
Fixes: 3dc5d4454545 ("net: ks8851: Fix TX stall caused by TX buffer overrun") Cc: "David S. Miller" davem@davemloft.net Cc: Eric Dumazet edumazet@google.com Cc: Jakub Kicinski kuba@kernel.org Cc: Paolo Abeni pabeni@redhat.com Cc: Simon Horman horms@kernel.org Cc: netdev@vger.kernel.org Cc: stable@vger.kernel.org # 5.10+ Signed-off-by: Ronald Wahl ronald.wahl@raritan.com Reviewed-by: Jacob Keller jacob.e.keller@intel.com Link: https://patch.msgid.link/20240709195845.9089-1-rwahl@gmx.de Signed-off-by: Paolo Abeni pabeni@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/ethernet/micrel/ks8851_common.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/net/ethernet/micrel/ks8851_common.c +++ b/drivers/net/ethernet/micrel/ks8851_common.c @@ -499,6 +499,7 @@ static int ks8851_net_open(struct net_de ks8851_wrreg16(ks, KS_IER, ks->rc_ier);
ks->queued_len = 0; + ks->tx_space = ks8851_rdreg16(ks, KS_TXMIR); netif_start_queue(ks->netdev);
netif_dbg(ks, ifup, ks->netdev, "network device up\n"); @@ -1119,7 +1120,6 @@ int ks8851_probe_common(struct net_devic int ret;
ks->netdev = netdev; - ks->tx_space = 6144;
gpio = of_get_named_gpio_flags(dev->of_node, "reset-gpios", 0, NULL); if (gpio == -EPROBE_DEFER)