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authorEric Dumazet <eric.dumazet@gmail.com>2011-12-23 19:28:51 +0000
committerDavid S. Miller <davem@davemloft.net>2011-12-24 16:08:50 -0500
commitbb52c7acf871537a468433775151339f783d2e8c (patch)
treed31943c70571f28ff241234a2bffa765a1d4ef92
parent5f0a6e2d503896062f641639dacfe5055c2f593b (diff)
downloadlinux-linaro-bb52c7acf871537a468433775151339f783d2e8c.tar.gz
netem: dont call vfree() under spinlock and BH disabled
commit 6373a9a286 (netem: use vmalloc for distribution table) added a regression, since vfree() is called while holding a spinlock and BH being disabled. Fix this by doing the pointers swap in critical section, and freeing after spinlock release. Also add __GFP_NOWARN to the kmalloc() try, since we fallback to vmalloc(). Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Acked-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/sched/sch_netem.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/net/sched/sch_netem.c b/net/sched/sch_netem.c
index eb3b9a86c6e..a4ab207cdc5 100644
--- a/net/sched/sch_netem.c
+++ b/net/sched/sch_netem.c
@@ -488,7 +488,7 @@ static int get_dist_table(struct Qdisc *sch, const struct nlattr *attr)
return -EINVAL;
s = sizeof(struct disttable) + n * sizeof(s16);
- d = kmalloc(s, GFP_KERNEL);
+ d = kmalloc(s, GFP_KERNEL | __GFP_NOWARN);
if (!d)
d = vmalloc(s);
if (!d)
@@ -501,9 +501,10 @@ static int get_dist_table(struct Qdisc *sch, const struct nlattr *attr)
root_lock = qdisc_root_sleeping_lock(sch);
spin_lock_bh(root_lock);
- dist_free(q->delay_dist);
- q->delay_dist = d;
+ swap(q->delay_dist, d);
spin_unlock_bh(root_lock);
+
+ dist_free(d);
return 0;
}