Patch "net: mvneta: Fix spinlock usage" has been added to the 4.5-stable tree

Patch "net: mvneta: Fix spinlock usage" has been added to the 4.5-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    net: mvneta: Fix spinlock usage

to the 4.5-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     net-mvneta-fix-spinlock-usage.patch
and it can be found in the queue-4.5 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Sat Apr 16 09:15:18 PDT 2016
From: Gregory CLEMENT <gregory.clement@free-electrons.com>
Date: Sat, 12 Mar 2016 18:44:17 +0100
Subject: net: mvneta: Fix spinlock usage

From: Gregory CLEMENT <gregory.clement@free-electrons.com>

[ Upstream commit 1c2722a975fdb8c90bc6ba8570b7fb62db4e2e9c ]

In the previous patch, the spinlock was not initialized. While it didn't
cause any trouble yet it could be a problem to use it uninitialized.

The most annoying part was the critical section protected by the spinlock
in mvneta_stop(). Some of the functions could sleep as pointed when
activated CONFIG_DEBUG_ATOMIC_SLEEP. Actually, in mvneta_stop() we only
need to protect the is_stopped flagged, indeed the code of the notifier
for CPU online is protected by the same spinlock, so when we get the
lock, the notifer work is done.

Reported-by: Patrick Uiterwijk <patrick@puiterwijk.org>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/ethernet/marvell/mvneta.c |   11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

--- a/drivers/net/ethernet/marvell/mvneta.c
+++ b/drivers/net/ethernet/marvell/mvneta.c
@@ -3070,17 +3070,17 @@ static int mvneta_stop(struct net_device
 	struct mvneta_port *pp = netdev_priv(dev);
 
 	/* Inform that we are stopping so we don't want to setup the
-	 * driver for new CPUs in the notifiers
+	 * driver for new CPUs in the notifiers. The code of the
+	 * notifier for CPU online is protected by the same spinlock,
+	 * so when we get the lock, the notifer work is done.
 	 */
 	spin_lock(&pp->lock);
 	pp->is_stopped = true;
+	spin_unlock(&pp->lock);
+
 	mvneta_stop_dev(pp);
 	mvneta_mdio_remove(pp);
 	unregister_cpu_notifier(&pp->cpu_notifier);
-	/* Now that the notifier are unregistered, we can release le
-	 * lock
-	 */
-	spin_unlock(&pp->lock);
 	on_each_cpu(mvneta_percpu_disable, pp, true);
 	free_percpu_irq(dev->irq, pp->ports);
 	mvneta_cleanup_rxqs(pp);
@@ -3612,6 +3612,7 @@ static int mvneta_probe(struct platform_
 	dev->ethtool_ops = &mvneta_eth_tool_ops;
 
 	pp = netdev_priv(dev);
+	spin_lock_init(&pp->lock);
 	pp->phy_node = phy_node;
 	pp->phy_interface = phy_mode;
 


Patches currently in stable-queue which might be from gregory.clement@free-electrons.com are

queue-4.5/net-mvneta-fix-spinlock-usage.patch