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net_sched: make cls_ops->change and cls_ops->delete optional

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Some schedulers don't support creating, changing or deleting classes.
Make the respective callbacks optionally and consistently return
-EOPNOTSUPP for unsupported operations, instead of currently either
-EOPNOTSUPP, -ENOSYS or no error.

In case of sch_prio and sch_multiq, the removed operations additionally
checked for an invalid class. This is not necessary since the class
argument can only orginate from ->get() or in case of ->change is 0
for creation of new classes, in which case ->change() incorrectly
returned -ENOENT.

As a side-effect, this patch fixes a possible (root-only) NULL pointer
function call in sch_ingress, which didn't implement a so far mandatory
->delete() operation.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy
2009-09-04 06:41:16 +00:00
committed by David S. Miller
parent 71ebe5e919
commit de6d5cdf88
7 changed files with 6 additions and 85 deletions
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22
net/sched/sch_multiq.c
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@ -348,26 +348,6 @@ static void multiq_put(struct Qdisc *q, unsigned long cl)
return;
}
static int multiq_change(struct Qdisc *sch, u32 handle, u32 parent,
struct nlattr **tca, unsigned long *arg)
{
unsigned long cl = *arg;
struct multiq_sched_data *q = qdisc_priv(sch);
if (cl - 1 > q->bands)
return -ENOENT;
return 0;
}
static int multiq_delete(struct Qdisc *sch, unsigned long cl)
{
struct multiq_sched_data *q = qdisc_priv(sch);
if (cl - 1 > q->bands)
return -ENOENT;
return 0;
}
static int multiq_dump_class(struct Qdisc *sch, unsigned long cl,
struct sk_buff *skb, struct tcmsg *tcm)
{
@ -430,8 +410,6 @@ static const struct Qdisc_class_ops multiq_class_ops = {
.leaf = multiq_leaf,
.get = multiq_get,
.put = multiq_put,
.change = multiq_change,
.delete = multiq_delete,
.walk = multiq_walk,
.tcf_chain = multiq_find_tcf,
.bind_tcf = multiq_bind,