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authorJamal Hadi Salim <hadi@cyberus.ca>2007-09-12 16:32:59 +0200
committerDavid S. Miller <davem@sunset.davemloft.net>2007-09-14 16:43:05 -0700
commite1e992e52faa588667e1378a2573b4b8e3fa6670 (patch)
tree771f664db9e2d7119dfea92a117deeb89e7b55e5
parent4878809f711981a602cc562eb47994fc81ea0155 (diff)
downloadlinux-linaro-e1e992e52faa588667e1378a2573b4b8e3fa6670.tar.gz
[NET_SCHED] protect action config/dump from irqs
(with no apologies to C Heston) On Mon, 2007-10-09 at 21:00 +0800, Herbert Xu wrote: On Sun, Sep 02, 2007 at 01:11:29PM +0000, Christian Kujau wrote: > > > > after upgrading to 2.6.23-rc5 (and applying davem's fix [0]), lockdep > > was quite noisy when I tried to shape my external (wireless) interface: > > > > [ 6400.534545] FahCore_78.exe/3552 just changed the state of lock: > > [ 6400.534713] (&dev->ingress_lock){-+..}, at: [<c038d595>] > > netif_receive_skb+0x2d5/0x3c0 > > [ 6400.534941] but this lock took another, soft-read-irq-unsafe lock in the > > past: > > [ 6400.535145] (police_lock){-.--} > > This is a genuine dead-lock. The police lock can be taken > for reading with softirqs on. If a second CPU tries to take > the police lock for writing, while holding the ingress lock, > then a softirq on the first CPU can dead-lock when it tries > to get the ingress lock. Signed-off-by: Jamal Hadi Salim <hadi@cyberus.ca> Acked-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/sched/act_api.c8
-rw-r--r--net/sched/act_police.c4
2 files changed, 6 insertions, 6 deletions
diff --git a/net/sched/act_api.c b/net/sched/act_api.c
index feef366cad5..72cdb0fade2 100644
--- a/net/sched/act_api.c
+++ b/net/sched/act_api.c
@@ -68,7 +68,7 @@ static int tcf_dump_walker(struct sk_buff *skb, struct netlink_callback *cb,
int err = 0, index = -1,i = 0, s_i = 0, n_i = 0;
struct rtattr *r ;
- read_lock(hinfo->lock);
+ read_lock_bh(hinfo->lock);
s_i = cb->args[0];
@@ -96,7 +96,7 @@ static int tcf_dump_walker(struct sk_buff *skb, struct netlink_callback *cb,
}
}
done:
- read_unlock(hinfo->lock);
+ read_unlock_bh(hinfo->lock);
if (n_i)
cb->args[0] += n_i;
return n_i;
@@ -156,13 +156,13 @@ struct tcf_common *tcf_hash_lookup(u32 index, struct tcf_hashinfo *hinfo)
{
struct tcf_common *p;
- read_lock(hinfo->lock);
+ read_lock_bh(hinfo->lock);
for (p = hinfo->htab[tcf_hash(index, hinfo->hmask)]; p;
p = p->tcfc_next) {
if (p->tcfc_index == index)
break;
}
- read_unlock(hinfo->lock);
+ read_unlock_bh(hinfo->lock);
return p;
}
diff --git a/net/sched/act_police.c b/net/sched/act_police.c
index 6085be57845..17f6f27e28a 100644
--- a/net/sched/act_police.c
+++ b/net/sched/act_police.c
@@ -56,7 +56,7 @@ static int tcf_act_police_walker(struct sk_buff *skb, struct netlink_callback *c
int err = 0, index = -1, i = 0, s_i = 0, n_i = 0;
struct rtattr *r;
- read_lock(&police_lock);
+ read_lock_bh(&police_lock);
s_i = cb->args[0];
@@ -85,7 +85,7 @@ static int tcf_act_police_walker(struct sk_buff *skb, struct netlink_callback *c
}
}
done:
- read_unlock(&police_lock);
+ read_unlock_bh(&police_lock);
if (n_i)
cb->args[0] += n_i;
return n_i;