net: stmmac: delete the eee_ctrl_timer after napi disabled

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@nxp.com>
Signed-off-by: Joakim Zhang <qiangqing.zhang@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 7452f3c..d2521eb 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -2908,9 +2908,6 @@ static int stmmac_release(struct net_device *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 */
@@ -2929,6 +2926,11 @@ static int stmmac_release(struct net_device *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);
 
@@ -5155,6 +5157,11 @@ 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);