lkml.org 
[lkml]   [2020]   [Nov]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH stable] net: sch_generic: fix the missing new qdisc assignment bug
Date
commit 2fb541c862c9 ("net: sch_generic: aviod concurrent reset and enqueue op for lockless qdisc")

When the above upstream commit is backported to stable kernel,
one assignment is missing, which causes two problems reported
by Joakim and Vishwanath, see [1] and [2].

So add the assignment back to fix it.

1. https://www.spinics.net/lists/netdev/msg693916.html
2. https://www.spinics.net/lists/netdev/msg695131.html

Fixes: 749cc0b0c7f3 ("net: sch_generic: aviod concurrent reset and enqueue op for lockless qdisc")
Signed-off-by: Yunsheng Lin <linyunsheng@huawei.com>
---
net/sched/sch_generic.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c
index 0e275e1..6e6147a 100644
--- a/net/sched/sch_generic.c
+++ b/net/sched/sch_generic.c
@@ -1127,10 +1127,13 @@ static void dev_deactivate_queue(struct net_device *dev,
void *_qdisc_default)
{
struct Qdisc *qdisc = rtnl_dereference(dev_queue->qdisc);
+ struct Qdisc *qdisc_default = _qdisc_default;

if (qdisc) {
if (!(qdisc->flags & TCQ_F_BUILTIN))
set_bit(__QDISC_STATE_DEACTIVATED, &qdisc->state);
+
+ rcu_assign_pointer(dev_queue->qdisc, qdisc_default);
}
}

--
2.7.4
\
 
 \ /
  Last update: 2020-11-03 04:30    [W:0.086 / U:0.812 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site