netdev - [PATCH net-next] net/sched: remove qdisc_root

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Date:   Mon, 18 Jul 2022 10:55:12 +0200
From:   Davide Caratti <dcaratti@...hat.com>
To:     "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Subject: [PATCH net-next] net/sched: remove qdisc_root_lock() helper

the last caller has been removed with commit 96f5e66e8a79 ("mac80211: fix
aggregation for hardware with ampdu queues"), so it's safe to remove this
function.

Signed-off-by: Davide Caratti <dcaratti@...hat.com>
---
 include/net/sch_generic.h | 19 -------------------
 1 file changed, 19 deletions(-)

diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index d6cf5116b5f9..ec693fe7c553 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -551,25 +551,6 @@ static inline struct Qdisc *qdisc_root_sleeping(const struct Qdisc *qdisc)
 	return qdisc->dev_queue->qdisc_sleeping;
 }
 
-/* The qdisc root lock is a mechanism by which to top level
- * of a qdisc tree can be locked from any qdisc node in the
- * forest.  This allows changing the configuration of some
- * aspect of the qdisc tree while blocking out asynchronous
- * qdisc access in the packet processing paths.
- *
- * It is only legal to do this when the root will not change
- * on us.  Otherwise we'll potentially lock the wrong qdisc
- * root.  This is enforced by holding the RTNL semaphore, which
- * all users of this lock accessor must do.
- */
-static inline spinlock_t *qdisc_root_lock(const struct Qdisc *qdisc)
-{
-	struct Qdisc *root = qdisc_root(qdisc);
-
-	ASSERT_RTNL();
-	return qdisc_lock(root);
-}
-
 static inline spinlock_t *qdisc_root_sleeping_lock(const struct Qdisc *qdisc)
 {
 	struct Qdisc *root = qdisc_root_sleeping(qdisc);
-- 
2.35.3