netdev - [net-next 3/3] stmmac: fix suspend/resume locking

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1336983523-4075-3-git-send-email-peppe.cavallaro@st.com>
Date:	Mon, 14 May 2012 10:18:43 +0200
From:	Giuseppe CAVALLARO <peppe.cavallaro@...com>
To:	netdev@...r.kernel.org
Cc:	Giuseppe Cavallaro <peppe.cavallaro@...com>
Subject: [net-next 3/3] 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@...com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c |   10 ++++++----
 1 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index d1d0840..d07bc6d 100644
--- 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);
-- 
1.7.4.4

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html