This is a note to let you know that I've just added the patch titled
net: stmmac: delete the eee_ctrl_timer after napi disabled
to the 5.9-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-stmmac-delete-the-eee_ctrl_timer-after-napi-disabled.patch
and it can be found in the queue-5.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Sat Dec 19 11:38:44 AM CET 2020
From: Fugang Duan <fugang.duan@xxxxxxx>
Date: Mon, 7 Dec 2020 18:51:40 +0800
Subject: net: stmmac: delete the eee_ctrl_timer after napi disabled
From: Fugang Duan <fugang.duan@xxxxxxx>
[ Upstream commit 5f58591323bf3f342920179f24515935c4b5fd60 ]
There have chance to re-enable the eee_ctrl_timer and fire the timer
in napi callback after delete the timer in .stmmac_release(), which
introduces to access eee registers in the timer function after clocks
are disabled then causes system hang. Found this issue when do
suspend/resume and reboot stress test.
It is safe to delete the timer after napi disabled and disable lpi mode.
Fixes: d765955d2ae0b ("stmmac: add the Energy Efficient Ethernet support")
Signed-off-by: Fugang Duan <fugang.duan@xxxxxxx>
Signed-off-by: Joakim Zhang <qiangqing.zhang@xxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -2893,9 +2893,6 @@ static int stmmac_release(struct net_dev
struct stmmac_priv *priv = netdev_priv(dev);
u32 chan;
- if (priv->eee_enabled)
- del_timer_sync(&priv->eee_ctrl_timer);
-
if (device_may_wakeup(priv->device))
phylink_speed_down(priv->phylink, false);
/* Stop and disconnect the PHY */
@@ -2914,6 +2911,11 @@ static int stmmac_release(struct net_dev
if (priv->lpi_irq > 0)
free_irq(priv->lpi_irq, dev);
+ if (priv->eee_enabled) {
+ priv->tx_path_in_lpi_mode = false;
+ del_timer_sync(&priv->eee_ctrl_timer);
+ }
+
/* Stop TX/RX DMA and clear the descriptors */
stmmac_stop_all_dma(priv);
@@ -5077,6 +5079,11 @@ int stmmac_suspend(struct device *dev)
for (chan = 0; chan < priv->plat->tx_queues_to_use; chan++)
del_timer_sync(&priv->tx_queue[chan].txtimer);
+ if (priv->eee_enabled) {
+ priv->tx_path_in_lpi_mode = false;
+ del_timer_sync(&priv->eee_ctrl_timer);
+ }
+
/* Stop TX/RX DMA */
stmmac_stop_all_dma(priv);
Patches currently in stable-queue which might be from fugang.duan@xxxxxxx are
queue-5.9/net-stmmac-free-tx-skb-buffer-in-stmmac_resume.patch
queue-5.9/net-stmmac-overwrite-the-dma_cap.addr64-according-to-hw-design.patch
queue-5.9/net-stmmac-start-phylink-instance-before-stmmac_hw_setup.patch
queue-5.9/net-stmmac-delete-the-eee_ctrl_timer-after-napi-disabled.patch
queue-5.9/net-stmmac-increase-the-timeout-for-dma-reset.patch
