stmmac: fix suspend/resume locking

Upon resume from standby, there is a possible interrupt
unsafe locking scenario raised when configure the Kernel
with CONFIG_PROVE_LOCKING. So this patch fixes that in
PM driver stuff by calling lock/unlock_irqsave/restore.

Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.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 d1d0840..d07bc6d 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -1989,6 +1989,7 @@ int stmmac_suspend(struct net_device *ndev)
 {
        struct stmmac_priv *priv = netdev_priv(ndev);
        int dis_ic = 0;
+       unsigned long flags;
 
        if (!ndev || !netif_running(ndev))
                return 0;
@@ -1996,7 +1997,7 @@ int stmmac_suspend(struct net_device *ndev)
        if (priv->phydev)
                phy_stop(priv->phydev);
 
-       spin_lock(&priv->lock);
+       spin_lock_irqsave(&priv->lock, flags);
 
        netif_device_detach(ndev);
        netif_stop_queue(ndev);
@@ -2024,18 +2025,19 @@ int stmmac_suspend(struct net_device *ndev)
                /* Disable clock in case of PWM is off */
                stmmac_clk_disable(priv);
        }
-       spin_unlock(&priv->lock);
+       spin_unlock_irqrestore(&priv->lock, flags);
        return 0;
 }
 
 int stmmac_resume(struct net_device *ndev)
 {
        struct stmmac_priv *priv = netdev_priv(ndev);
+       unsigned long flags;
 
        if (!netif_running(ndev))
                return 0;
 
-       spin_lock(&priv->lock);
+       spin_lock_irqsave(&priv->lock, flags);
 
        /* Power Down bit, into the PM register, is cleared
         * automatically as soon as a magic packet or a Wake-up frame
@@ -2063,7 +2065,7 @@ int stmmac_resume(struct net_device *ndev)
 
        netif_start_queue(ndev);
 
-       spin_unlock(&priv->lock);
+       spin_unlock_irqrestore(&priv->lock, flags);
 
        if (priv->phydev)
                phy_start(priv->phydev);