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net: sched: Add the invalid handle check in qdisc_class_find

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Add the invalid handle "0" check to avoid unnecessary search, because
the qdisc uses the skb->priority as the handle value to look up, and
it is "0" usually.

Signed-off-by: Gao Feng <gfree.wind@vip.163.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Gao Feng 2017-08-18 15:23:24 +08:00 committed by David S. Miller
parent 40501f90ed
commit 7d3f0cd43f
1 changed files with 3 additions and 0 deletions
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3
include/net/sch_generic.h
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@ -393,6 +393,9 @@ qdisc_class_find(const struct Qdisc_class_hash *hash, u32 id)
struct Qdisc_class_common *cl;
unsigned int h;
if (!id)
return NULL;
h = qdisc_class_hash(id, hash->hashmask);
hlist_for_each_entry(cl, &hash->hash[h], hnode) {
if (cl->classid == id)