From: Jarek Poplawski <jarkao2@gmail.com>
Date: Fri, 22 Aug 2008 10:24:05 +0000 (-0700)
Subject: pkt_sched: Fix qdisc list locking
X-Git-Tag: v2.6.27-rc5~42^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f6e0b239a2657ea8cb67f0d83d0bfdbfd19a481b;p=pandora-kernel.git

pkt_sched: Fix qdisc list locking

Since some qdiscs call qdisc_tree_decrease_qlen() (so qdisc_lookup())
without rtnl_lock(), adding and deleting from a qdisc list needs
additional locking. This patch adds global spinlock qdisc_list_lock
and wrapper functions for modifying the list. It is considered as a
temporary solution until hfsc_dequeue(), netem_dequeue() and
tbf_dequeue() (or qdisc_tree_decrease_qlen()) are redone.

With feedback from Herbert Xu and David S. Miller.

Signed-off-by: Jarek Poplawski <jarkao2@gmail.com>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

Reading git-diff-tree failed