netdev - [PATCH 01/10] net: mvneta: ensure PM paths take the rtnl lock

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: <E1eWQIk-0003SD-3T@rmk-PC.armlinux.org.uk>
Date:   Tue, 02 Jan 2018 17:24:34 +0000
From:   Russell King <rmk+kernel@...linux.org.uk>
To:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
Cc:     netdev@...r.kernel.org
Subject: [PATCH 01/10] net: mvneta: ensure PM paths take the rtnl lock

The netdev core always ensures that the rtnl lock is held while calling
the ndo_open() and ndo_stop() methods. However, the suspend/resume paths
do not hold the rtnl lock. phylink will expect the rtnl lock to be held
when the MAC driver calls it, so we end up with kernel warnings. Take
the lock to ensure that these functions are called in a consistent
manner.

Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>
---
 drivers/net/ethernet/marvell/mvneta.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c
index a539263cd79c..e08bd20352cb 100644
--- a/drivers/net/ethernet/marvell/mvneta.c
+++ b/drivers/net/ethernet/marvell/mvneta.c
@@ -4426,8 +4426,10 @@ static int mvneta_suspend(struct device *device)
 	struct net_device *dev = dev_get_drvdata(device);
 	struct mvneta_port *pp = netdev_priv(dev);
 
+	rtnl_lock();
 	if (netif_running(dev))
 		mvneta_stop(dev);
+	rtnl_unlock();
 	netif_device_detach(dev);
 	clk_disable_unprepare(pp->clk_bus);
 	clk_disable_unprepare(pp->clk);
@@ -4464,10 +4466,12 @@ static int mvneta_resume(struct device *device)
 		mvneta_fixed_link_update(pp, dev->phydev);
 
 	netif_device_attach(dev);
+	rtnl_lock();
 	if (netif_running(dev)) {
 		mvneta_open(dev);
 		mvneta_set_rx_mode(dev);
 	}
+	rtnl_unlock();
 
 	return 0;
 }
-- 
2.7.4