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Commit bb047ddd authored by Jiri Pirko's avatar Jiri Pirko Committed by David S. Miller
Browse files

net: sched: don't set q pointer for shared blocks 



It is pointless to set block->q for block which are shared among
multiple qdiscs. So remove the assignment in that case. Do a bit of code
reshuffle to make block->index initialized at that point so we can use
tcf_block_shared() helper.

Reported-by: default avatarCong Wang <xiyou.wangcong@gmail.com>
Fixes: 48617387 ("net: sched: introduce shared filter blocks infrastructure")
Signed-off-by: default avatarJiri Pirko <jiri@mellanox.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 0f2d2b27

net/sched/cls_api.c

+12 −14
Original line number Diff line number Diff line
@@ -376,17 +376,12 @@ struct tcf_net { 
static unsigned int tcf_net_id;



static int tcf_block_insert(struct tcf_block *block, struct net *net,

			    u32 block_index, struct netlink_ext_ack *extack)

			    struct netlink_ext_ack *extack)

{

	struct tcf_net *tn = net_generic(net, tcf_net_id);

	int err;



	err = idr_alloc_u32(&tn->idr, block, &block_index, block_index,

	return idr_alloc_u32(&tn->idr, block, &block->index, block->index,

			     GFP_KERNEL);

	if (err)

		return err;

	block->index = block_index;

	return 0;

}



static void tcf_block_remove(struct tcf_block *block, struct net *net)
@@ -397,6 +392,7 @@ static void tcf_block_remove(struct tcf_block *block, struct net *net) 
}



static struct tcf_block *tcf_block_create(struct net *net, struct Qdisc *q,

					  u32 block_index,

					  struct netlink_ext_ack *extack)

{

	struct tcf_block *block;
@@ -419,9 +415,12 @@ static struct tcf_block *tcf_block_create(struct net *net, struct Qdisc *q, 
		err = -ENOMEM;

		goto err_chain_create;

	}

	block->net = qdisc_net(q);

	block->refcnt = 1;

	block->net = net;

	block->index = block_index;



	/* Don't store q pointer for blocks which are shared */

	if (!tcf_block_shared(block))

		block->q = q;

	return block;
@@ -518,13 +517,12 @@ int tcf_block_get_ext(struct tcf_block **p_block, struct Qdisc *q, 
	}



	if (!block) {

		block = tcf_block_create(net, q, extack);

		block = tcf_block_create(net, q, ei->block_index, extack);

		if (IS_ERR(block))

			return PTR_ERR(block);

		created = true;

		if (ei->block_index) {

			err = tcf_block_insert(block, net,

					       ei->block_index, extack);

		if (tcf_block_shared(block)) {

			err = tcf_block_insert(block, net, extack);

			if (err)

				goto err_block_insert;

		}