[PATCH] team: set qdisc_tx_busylock to avoid LOCKDEP splat

From: Eric Dumazet <redacted>

If a qdisc is installed on a team device, its possible to get
a lockdep splat under stress, because nested dev_queue_xmit() can
lock busylock a second time (on a different device, so its a false
positive)

Avoid this problem using a distinct lock_class_key for team
devices.

Signed-off-by: Eric Dumazet <redacted>
Cc: Jiri Pirko <redacted>
---
drivers/net/team/team.c |    2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/net/team/team.c b/drivers/net/team/team.c
index 5c7547c..d44cca3 100644
--- a/drivers/net/team/team.c
+++ b/drivers/net/team/team.c

@@ -1315,6 +1315,7 @@ static const struct team_option team_options[] = {

static struct lock_class_key team_netdev_xmit_lock_key;
static struct lock_class_key team_netdev_addr_lock_key;
+static struct lock_class_key team_tx_busylock_key;

static void team_set_lockdep_class_one(struct net_device *dev,
				       struct netdev_queue *txq,

@@ -1327,6 +1328,7 @@ static void team_set_lockdep_class(struct net_device *dev)

{
	lockdep_set_class(&dev->addr_list_lock, &team_netdev_addr_lock_key);
	netdev_for_each_tx_queue(dev, team_set_lockdep_class_one, NULL);
+	dev->qdisc_tx_busylock = &team_tx_busylock_key;
}

static int team_init(struct net_device *dev)


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