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Date: Sat, 5 Dec 2009 14:23:54 -0800
From: Amit Kumar Salecha <amit.salecha@...gic.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org, dhananjay.phadke@...gic.com
Subject: [PATCH NEXT 1/3] netxen: protect device reset by rtnl_lock
o To prevent race conditions with other reset events.
During suspend/resume and firmware recovery, acquire rtnl_lock,
while changing interface state.
Acked-by: Dhananjay Phadke <dhananjay.phadke@...gic.com>
Signed-off-by: Amit Kumar Salecha <amit.salecha@...gic.com>
---
drivers/net/netxen/netxen_nic_main.c | 43 +++++++++++++++++++++++++++------
1 files changed, 35 insertions(+), 8 deletions(-)
diff --git a/drivers/net/netxen/netxen_nic_main.c b/drivers/net/netxen/netxen_nic_main.c
index e5d187f..8ffb30b 100644
--- a/drivers/net/netxen/netxen_nic_main.c
+++ b/drivers/net/netxen/netxen_nic_main.c
@@ -946,8 +946,9 @@ netxen_nic_init_coalesce_defaults(struct netxen_adapter *adapter)
NETXEN_DEFAULT_INTR_COALESCE_TX_PACKETS;
}
+/* with rtnl_lock */
static int
-netxen_nic_up(struct netxen_adapter *adapter, struct net_device *netdev)
+__netxen_nic_up(struct netxen_adapter *adapter, struct net_device *netdev)
{
int err;
@@ -988,8 +989,24 @@ netxen_nic_up(struct netxen_adapter *adapter, struct net_device *netdev)
return 0;
}
+/* Usage: During resume and firmware recovery module.*/
+
+static inline int
+netxen_nic_up(struct netxen_adapter *adapter, struct net_device *netdev)
+{
+ int err = 0;
+
+ rtnl_lock();
+ if (netif_running(netdev))
+ err = __netxen_nic_up(adapter, netdev);
+ rtnl_unlock();
+
+ return err;
+}
+
+/* with rtnl_lock */
static void
-netxen_nic_down(struct netxen_adapter *adapter, struct net_device *netdev)
+__netxen_nic_down(struct netxen_adapter *adapter, struct net_device *netdev)
{
if (adapter->is_up != NETXEN_ADAPTER_UP_MAGIC)
return;
@@ -1014,6 +1031,17 @@ netxen_nic_down(struct netxen_adapter *adapter, struct net_device *netdev)
spin_unlock(&adapter->tx_clean_lock);
}
+/* Usage: During suspend and firmware recovery module */
+
+static inline void
+netxen_nic_down(struct netxen_adapter *adapter, struct net_device *netdev)
+{
+ rtnl_lock();
+ if (netif_running(netdev))
+ __netxen_nic_down(adapter, netdev);
+ rtnl_unlock();
+
+}
static int
netxen_nic_attach(struct netxen_adapter *adapter)
@@ -1122,14 +1150,14 @@ netxen_nic_reset_context(struct netxen_adapter *adapter)
netif_device_detach(netdev);
if (netif_running(netdev))
- netxen_nic_down(adapter, netdev);
+ __netxen_nic_down(adapter, netdev);
netxen_nic_detach(adapter);
if (netif_running(netdev)) {
err = netxen_nic_attach(adapter);
if (!err)
- err = netxen_nic_up(adapter, netdev);
+ err = __netxen_nic_up(adapter, netdev);
if (err)
goto done;
@@ -1499,7 +1527,7 @@ static int netxen_nic_open(struct net_device *netdev)
if (err)
return err;
- err = netxen_nic_up(adapter, netdev);
+ err = __netxen_nic_up(adapter, netdev);
if (err)
goto err_out;
@@ -1519,7 +1547,7 @@ static int netxen_nic_close(struct net_device *netdev)
{
struct netxen_adapter *adapter = netdev_priv(netdev);
- netxen_nic_down(adapter, netdev);
+ __netxen_nic_down(adapter, netdev);
return 0;
}
@@ -2210,8 +2238,7 @@ netxen_detach_work(struct work_struct *work)
netif_device_detach(netdev);
- if (netif_running(netdev))
- netxen_nic_down(adapter, netdev);
+ netxen_nic_down(adapter, netdev);
netxen_nic_detach(adapter);
--
1.6.0.2
--
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