mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-27 01:11:14 +00:00
53 lines
1.9 KiB
Diff
53 lines
1.9 KiB
Diff
From: Gregory CLEMENT <gregory.clement@free-electrons.com>
|
|
Date: Sat, 12 Mar 2016 18:44:17 +0100
|
|
Subject: [PATCH] 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: Patrick Uiterwijk <patrick@puiterwijk.org>
|
|
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
|
|
Signed-off-by: David S. Miller <davem@davemloft.net>
|
|
---
|
|
|
|
--- a/drivers/net/ethernet/marvell/mvneta.c
|
|
+++ b/drivers/net/ethernet/marvell/mvneta.c
|
|
@@ -3484,17 +3484,17 @@ 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);
|
|
@@ -4027,6 +4027,7 @@ 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;
|
|
|