stmmac: fix concurrency in eee initialization.
This patch aims to fix the concurrency in eee initialization inside the stmmac driver and related warnings when enable DEBUG_ATOMIC_SLEEP. Prior this patch, the stmmac_eee_init could be called in several places as shown below: stmmac_open stmmac_resume PHY Layer | | | stmmac_hw_setup stmmac_adjust_link | | stmmac ethtool |__________________________|______________| | stmmac_eee_init The patch removes the stmmac_eee_init call inside the stmmac_hw_setup that is unnecessary. It is sufficient to call it in the adjust_link to always guarantee that EEE is always configured at mac level too. Fixing the lock protection now it is covered another case (not considered before). The stmmac_eee_init could be called by the ethtool so critical sections must be protected inside this function too. Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com> Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -276,6 +276,7 @@ static void stmmac_eee_ctrl_timer(unsigned long arg)
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bool stmmac_eee_init(struct stmmac_priv *priv)
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{
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char *phy_bus_name = priv->plat->phy_bus_name;
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unsigned long flags;
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bool ret = false;
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/* Using PCS we cannot dial with the phy registers at this stage
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@ -300,6 +301,7 @@ bool stmmac_eee_init(struct stmmac_priv *priv)
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* changed).
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* In that case the driver disable own timers.
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*/
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spin_lock_irqsave(&priv->lock, flags);
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if (priv->eee_active) {
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pr_debug("stmmac: disable EEE\n");
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del_timer_sync(&priv->eee_ctrl_timer);
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@ -307,9 +309,11 @@ bool stmmac_eee_init(struct stmmac_priv *priv)
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tx_lpi_timer);
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}
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priv->eee_active = 0;
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spin_unlock_irqrestore(&priv->lock, flags);
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goto out;
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}
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/* Activate the EEE and start timers */
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spin_lock_irqsave(&priv->lock, flags);
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if (!priv->eee_active) {
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priv->eee_active = 1;
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init_timer(&priv->eee_ctrl_timer);
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@ -325,9 +329,10 @@ bool stmmac_eee_init(struct stmmac_priv *priv)
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/* Set HW EEE according to the speed */
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priv->hw->mac->set_eee_pls(priv->hw, priv->phydev->link);
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pr_debug("stmmac: Energy-Efficient Ethernet initialized\n");
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ret = true;
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spin_unlock_irqrestore(&priv->lock, flags);
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pr_debug("stmmac: Energy-Efficient Ethernet initialized\n");
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}
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out:
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return ret;
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@ -760,12 +765,12 @@ static void stmmac_adjust_link(struct net_device *dev)
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if (new_state && netif_msg_link(priv))
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phy_print_status(phydev);
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spin_unlock_irqrestore(&priv->lock, flags);
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/* At this stage, it could be needed to setup the EEE or adjust some
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* MAC related HW registers.
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*/
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priv->eee_enabled = stmmac_eee_init(priv);
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spin_unlock_irqrestore(&priv->lock, flags);
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}
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/**
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@ -1705,8 +1710,6 @@ static int stmmac_hw_setup(struct net_device *dev)
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}
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priv->tx_lpi_timer = STMMAC_DEFAULT_TWT_LS;
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priv->eee_enabled = stmmac_eee_init(priv);
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stmmac_init_tx_coalesce(priv);
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if ((priv->use_riwt) && (priv->hw->dma->rx_watchdog)) {
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