[V2 Patch net-next-2.6] netpoll: disable netpoll when enslave a device
From: Amerigo Wang <hidden>
Date: 2011-05-19 08:40:21
Also in:
lkml
Subsystem:
bonding driver, netconsole, networking drivers, the rest · Maintainers:
Jay Vosburgh, Breno Leitao, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
Currently we do nothing when we enslave a net device which is running netconsole. Neil pointed out that we may get weird results in such case, so let's disable netpoll on the device being enslaved. I think it is too harsh to prevent the device being ensalved if it is running netconsole. By the way, this patch also removes the NETDEV_GOING_DOWN from netconsole netdev notifier, because netpoll will check if the device is running or not and we don't handle NETDEV_PRE_UP neither. Signed-off-by: WANG Cong <redacted> Cc: Neil Horman <redacted> --- drivers/net/bonding/bond_main.c | 2 ++ drivers/net/netconsole.c | 26 +++++++++++++++++--------- include/linux/notifier.h | 1 + 3 files changed, 20 insertions(+), 9 deletions(-)
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 088fd84..b9c70c5 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c@@ -1640,6 +1640,8 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev) } } + netdev_bonding_change(slave_dev, NETDEV_ENSLAVE); + /* If this is the first slave, then we need to set the master's hardware * address to be the same as the slave's. */ if (is_zero_ether_addr(bond->dev->dev_addr))
diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c
index a83e101..c2a8230 100644
--- a/drivers/net/netconsole.c
+++ b/drivers/net/netconsole.c@@ -621,11 +621,10 @@ static int netconsole_netdev_event(struct notifier_block *this, bool stopped = false; if (!(event == NETDEV_CHANGENAME || event == NETDEV_UNREGISTER || - event == NETDEV_BONDING_DESLAVE || event == NETDEV_GOING_DOWN)) + event == NETDEV_BONDING_DESLAVE || event == NETDEV_ENSLAVE)) goto done; spin_lock_irqsave(&target_list_lock, flags); -restart: list_for_each_entry(nt, &target_list, list) { netconsole_target_get(nt); if (nt->np.dev == dev) {
@@ -633,6 +632,8 @@ restart: case NETDEV_CHANGENAME: strlcpy(nt->np.dev_name, dev->name, IFNAMSIZ); break; + case NETDEV_BONDING_DESLAVE: + case NETDEV_ENSLAVE: case NETDEV_UNREGISTER: /* * rtnl_lock already held
@@ -647,11 +648,7 @@ restart: dev_put(nt->np.dev); nt->np.dev = NULL; netconsole_target_put(nt); - goto restart; } - /* Fall through */ - case NETDEV_GOING_DOWN: - case NETDEV_BONDING_DESLAVE: nt->enabled = 0; stopped = true; break;
@@ -660,10 +657,21 @@ restart: netconsole_target_put(nt); } spin_unlock_irqrestore(&target_list_lock, flags); - if (stopped && (event == NETDEV_UNREGISTER || event == NETDEV_BONDING_DESLAVE)) + if (stopped) { printk(KERN_INFO "netconsole: network logging stopped on " - "interface %s as it %s\n", dev->name, - event == NETDEV_UNREGISTER ? "unregistered" : "released slaves"); + "interface %s as it ", dev->name); + switch (event) { + case NETDEV_UNREGISTER: + printk(KERN_CONT "unregistered\n"); + break; + case NETDEV_BONDING_DESLAVE: + printk(KERN_CONT "released slaves\n"); + break; + case NETDEV_ENSLAVE: + printk(KERN_CONT "is enslaved\n"); + break; + } + } done: return NOTIFY_DONE;
diff --git a/include/linux/notifier.h b/include/linux/notifier.h
index 621dfa1..3d82867 100644
--- a/include/linux/notifier.h
+++ b/include/linux/notifier.h@@ -211,6 +211,7 @@ static inline int notifier_to_errno(int ret) #define NETDEV_UNREGISTER_BATCH 0x0011 #define NETDEV_BONDING_DESLAVE 0x0012 #define NETDEV_NOTIFY_PEERS 0x0013 +#define NETDEV_ENSLAVE 0x0014 #define SYS_DOWN 0x0001 /* Notify of system down */ #define SYS_RESTART SYS_DOWN