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>
diff --git a/net/sched/sch_netem.c b/net/sched/sch_netem.c
index eb3b9a8..a4ab207 100644
--- a/net/sched/sch_netem.c
+++ b/net/sched/sch_netem.c
@@ -488,7 +488,7 @@
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 @@
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;
}