Commit 1c2722a9 authored by Gregory CLEMENT's avatar Gregory CLEMENT Committed by David S. Miller

net: mvneta: Fix spinlock usage

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: default avatarPatrick Uiterwijk <patrick@puiterwijk.org>
Signed-off-by: default avatarGregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 8626c56c
...@@ -3480,17 +3480,17 @@ static int mvneta_stop(struct net_device *dev) ...@@ -3480,17 +3480,17 @@ static int mvneta_stop(struct net_device *dev)
struct mvneta_port *pp = netdev_priv(dev); struct mvneta_port *pp = netdev_priv(dev);
/* Inform that we are stopping so we don't want to setup the /* 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); spin_lock(&pp->lock);
pp->is_stopped = true; pp->is_stopped = true;
spin_unlock(&pp->lock);
mvneta_stop_dev(pp); mvneta_stop_dev(pp);
mvneta_mdio_remove(pp); mvneta_mdio_remove(pp);
unregister_cpu_notifier(&pp->cpu_notifier); 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); on_each_cpu(mvneta_percpu_disable, pp, true);
free_percpu_irq(dev->irq, pp->ports); free_percpu_irq(dev->irq, pp->ports);
mvneta_cleanup_rxqs(pp); mvneta_cleanup_rxqs(pp);
...@@ -4023,6 +4023,7 @@ static int mvneta_probe(struct platform_device *pdev) ...@@ -4023,6 +4023,7 @@ static int mvneta_probe(struct platform_device *pdev)
dev->ethtool_ops = &mvneta_eth_tool_ops; dev->ethtool_ops = &mvneta_eth_tool_ops;
pp = netdev_priv(dev); pp = netdev_priv(dev);
spin_lock_init(&pp->lock);
pp->phy_node = phy_node; pp->phy_node = phy_node;
pp->phy_interface = phy_mode; pp->phy_interface = phy_mode;
......
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