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); } }
On 11/2/20 10:25 PM, Yunsheng Lin wrote:
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.
https://urldefense.com/v3/__https://www.spinics.net/lists/netdev/msg693916.h...
https://urldefense.com/v3/__https://www.spinics.net/lists/netdev/msg695131.h...
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); } }
I have tested the patch on v5.4.71 and it fixes our issues.
Tested-by: Vishwanath Pai vpai@akamai.com
On Tue, 3 Nov 2020 11:25:38 +0800 Yunsheng Lin wrote:
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.
- https://www.spinics.net/lists/netdev/msg693916.html
- 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
Acked-by: Jakub Kicinski kuba@kernel.org
On Tue, Nov 03, 2020 at 11:25:38AM +0800, Yunsheng Lin wrote:
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.
- https://www.spinics.net/lists/netdev/msg693916.html
- 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(+)
What kernel tree(s) does this need to be backported to?
thanks,
greg k-h
On 2020/11/9 20:46, Greg KH wrote:
On Tue, Nov 03, 2020 at 11:25:38AM +0800, Yunsheng Lin wrote:
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.
- https://www.spinics.net/lists/netdev/msg693916.html
- 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(+)
What kernel tree(s) does this need to be backported to?
4.19.x and 5.4.x
Thanks
thanks,
greg k-h .
On Tue, Nov 10, 2020 at 08:58:17AM +0800, Yunsheng Lin wrote:
On 2020/11/9 20:46, Greg KH wrote:
On Tue, Nov 03, 2020 at 11:25:38AM +0800, Yunsheng Lin wrote:
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.
- https://www.spinics.net/lists/netdev/msg693916.html
- 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(+)
What kernel tree(s) does this need to be backported to?
4.19.x and 5.4.x
Now queued up, thanks.
greg k-h
On Tue, Nov 03, 2020 at 11:25:38AM +0800, Yunsheng Lin wrote:
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.
- https://www.spinics.net/lists/netdev/msg693916.html
- 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
For whatever it's worth, we've seen similar problems (particularly, ENOBUFS on AF_PACKET sockets) and have tested this fix on 4.19.y (we're also queueing it up on our 5.4.y branch, but haven't tested it as much):
Tested-by: Brian Norris briannorris@chromium.org
Thanks!
linux-stable-mirror@lists.linaro.org
-
Brian Norris -
Greg KH -
Jakub Kicinski -
Vishwanath Pai -
Yunsheng Lin