From 25bfcd5a78a377ea4c54a3c21e44590e2fc478a6 Mon Sep 17 00:00:00 2001 From: Jarek Poplawski Date: Mon, 18 Aug 2008 20:53:34 -0700 Subject: [PATCH] pkt_sched: Add lockdep annotation for qdisc locks Qdisc locks are initialized in the same function, qdisc_alloc(), so lockdep can't distinguish tx qdisc lock from rx and reports "possible recursive locking detected" when both these locks are taken eg. while using act_mirred with ifb. This looks like a false positive. Anyway, after this patch these locks will be reported more exactly. Reported-by: Denys Fedoryshchenko Signed-off-by: Jarek Poplawski Signed-off-by: David S. Miller --- net/sched/sch_api.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c index 98c00847a3d..7d7070b1eeb 100644 --- a/net/sched/sch_api.c +++ b/net/sched/sch_api.c @@ -27,6 +27,7 @@ #include #include #include +#include #include #include @@ -707,6 +708,10 @@ static int qdisc_graft(struct net_device *dev, struct Qdisc *parent, return err; } +/* lockdep annotation is needed for ingress; egress gets it only for name */ +static struct lock_class_key qdisc_tx_lock; +static struct lock_class_key qdisc_rx_lock; + /* Allocate and initialize new qdisc. @@ -767,6 +772,7 @@ qdisc_create(struct net_device *dev, struct netdev_queue *dev_queue, if (handle == TC_H_INGRESS) { sch->flags |= TCQ_F_INGRESS; handle = TC_H_MAKE(TC_H_INGRESS, 0); + lockdep_set_class(qdisc_lock(sch), &qdisc_rx_lock); } else { if (handle == 0) { handle = qdisc_alloc_handle(dev); @@ -774,6 +780,7 @@ qdisc_create(struct net_device *dev, struct netdev_queue *dev_queue, if (handle == 0) goto err_out3; } + lockdep_set_class(qdisc_lock(sch), &qdisc_tx_lock); } sch->handle = handle; -- 2.20.1