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authorPatrick McHardy <kaber@trash.net>2009-09-04 06:41:16 +0000
committerDavid S. Miller <davem@davemloft.net>2009-09-06 02:07:02 -0700
commitde6d5cdf881353f83006d5f3e28ac4fffd42145e (patch)
treeedc032e4d0a868578780facdd28fb0ee277aadc3 /net/sched/sch_api.c
parent71ebe5e91947392bc276af713827eab12b6db8e4 (diff)
net_sched: make cls_ops->change and cls_ops->delete optional
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>
Diffstat (limited to 'net/sched/sch_api.c')
-rw-r--r--net/sched/sch_api.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
index bef2d645a36..166fcca86e7 100644
--- a/net/sched/sch_api.c
+++ b/net/sched/sch_api.c
@@ -1417,7 +1417,9 @@ static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
goto out;
break;
case RTM_DELTCLASS:
- err = cops->delete(q, cl);
+ err = -EOPNOTSUPP;
+ if (cops->delete)
+ err = cops->delete(q, cl);
if (err == 0)
tclass_notify(skb, n, q, cl, RTM_DELTCLASS);
goto out;
@@ -1431,7 +1433,9 @@ static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
}
new_cl = cl;
- err = cops->change(q, clid, pid, tca, &new_cl);
+ err = -EOPNOTSUPP;
+ if (cops->change)
+ err = cops->change(q, clid, pid, tca, &new_cl);
if (err == 0)
tclass_notify(skb, n, q, new_cl, RTM_NEWTCLASS);