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authorJo-Philipp Wich <jow@openwrt.org>2012-01-03 23:08:15 +0000
committerJo-Philipp Wich <jow@openwrt.org>2012-01-03 23:08:15 +0000
commit237282ae8c9a4ceb8cb613e4262e13d5eaca545e (patch)
tree33ab6787db28e953989cec3effffbfa6fdddb43b /target/linux/generic/patches-2.6.39
parent8854c9011925f0f849b5a1f68a106cdedb059f7e (diff)
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backport upstream commit e1738bd9cecc5c867b0e2996470c1ff20f66ba79 to affected kernels (#9802) commit 8efa88540635 (sch_sfq: avoid giving spurious NET_XMIT_CN signals) forgot to call qdisc_tree_decrease_qlen() to signal upper levels that a packet (from another flow) was dropped, leading to various problems.
SVN-Revision: 29642
Diffstat (limited to 'target/linux/generic/patches-2.6.39')
-rw-r--r--target/linux/generic/patches-2.6.39/622-sched_sfq_fix_enqueue.patch41
1 files changed, 41 insertions, 0 deletions
diff --git a/target/linux/generic/patches-2.6.39/622-sched_sfq_fix_enqueue.patch b/target/linux/generic/patches-2.6.39/622-sched_sfq_fix_enqueue.patch
new file mode 100644
index 0000000000..122f62b9e6
--- /dev/null
+++ b/target/linux/generic/patches-2.6.39/622-sched_sfq_fix_enqueue.patch
@@ -0,0 +1,41 @@
+From: Eric Dumazet <eric.dumazet@gmail.com>
+Date: Fri, 29 Jul 2011 19:22:42 +0000 (+0000)
+Subject: sch_sfq: fix sfq_enqueue()
+X-Git-Tag: v3.1-rc1~24^2~29
+X-Git-Url: http://git.kernel.org/?p=linux%2Fkernel%2Fgit%2Ftorvalds%2Flinux-2.6.git;a=commitdiff_plain;h=e1738bd9cecc5c867b0e2996470c1ff20f66ba79
+
+sch_sfq: fix sfq_enqueue()
+
+commit 8efa88540635 (sch_sfq: avoid giving spurious NET_XMIT_CN signals)
+forgot to call qdisc_tree_decrease_qlen() to signal upper levels that a
+packet (from another flow) was dropped, leading to various problems.
+
+With help from Michal Soltys and Michal Pokrywka, who did a bisection.
+
+Bugzilla ref: https://bugzilla.kernel.org/show_bug.cgi?id=39372
+Debian ref: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=631945
+
+Reported-by: Lucas Bocchi <lucas.bocchi@gmail.com>
+Reported-and-bisected-by: Michal Pokrywka <wolfmoon@o2.pl>
+Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
+CC: Michal Soltys <soltys@ziu.info>
+Acked-by: Patrick McHardy <kaber@trash.net>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+---
+
+--- a/net/sched/sch_sfq.c
++++ b/net/sched/sch_sfq.c
+@@ -410,7 +410,12 @@ sfq_enqueue(struct sk_buff *skb, struct
+ /* Return Congestion Notification only if we dropped a packet
+ * from this flow.
+ */
+- return (qlen != slot->qlen) ? NET_XMIT_CN : NET_XMIT_SUCCESS;
++ if (qlen != slot->qlen)
++ return NET_XMIT_CN;
++
++ /* As we dropped a packet, better let upper stack know this */
++ qdisc_tree_decrease_qlen(sch, 1);
++ return NET_XMIT_SUCCESS;
+ }
+
+ static struct sk_buff *