net: sched: fix qdisc->running lockdep annotations

1) qdisc_run_begin() is really using the equivalent of a trylock.
  Instead of using write_seqcount_begin(), use a combination of
  raw_write_seqcount_begin() and correct lockdep annotation.

2) sch_direct_xmit() should use regular spin_lock(root_lock)

Fixes: f9eb8ae ("net_sched: transform qdisc running bit into a seqcount")
Signed-off-by: Eric Dumazet <[email protected]>
Reported-by: David Ahern <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: edumazet

include/net/sch_generic.h

@@ -97,7 +97,11 @@ static inline bool qdisc_run_begin(struct Qdisc *qdisc)
 {
 	if (qdisc_is_running(qdisc))
 		return false;
-	write_seqcount_begin(&qdisc->running);
+	/* Variant of write_seqcount_begin() telling lockdep a trylock
+	 * was attempted.
+	 */
+	raw_write_seqcount_begin(&qdisc->running);
+	seqcount_acquire(&qdisc->running.dep_map, 0, 1, _RET_IP_);
 	return true;
 }
 

net/sched/sch_generic.c

@@ -137,10 +137,10 @@ int sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q,
 
 		HARD_TX_UNLOCK(dev, txq);
 	} else {
-		spin_lock_nested(root_lock, SINGLE_DEPTH_NESTING);
+		spin_lock(root_lock);
 		return qdisc_qlen(q);
 	}
-	spin_lock_nested(root_lock, SINGLE_DEPTH_NESTING);
+	spin_lock(root_lock);
 
 	if (dev_xmit_complete(ret)) {
 		/* Driver sent out skb successfully or skb was consumed */