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net: sched: protect block idr with spinlock 

Protect block idr access with spinlock, instead of relying on rtnl lock.
Take tn->idr_lock spinlock during block insertion and removal.

Signed-off-by: Vlad Buslov <vladbu@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vlad Buslov 2018-09-24 19:22:56 +03:00 committed by David S. Miller
parent f00234367b
commit ab2816295f
1 changed files with 13 additions and 2 deletions
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15
net/sched/cls_api.c
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@ -473,6 +473,7 @@ tcf_chain0_head_change_cb_del(struct tcf_block *block,
}
struct tcf_net {
spinlock_t idr_lock; /* Protects idr */
struct idr idr;
};
@ -482,16 +483,25 @@ static int tcf_block_insert(struct tcf_block *block, struct net *net,
struct netlink_ext_ack *extack)
{
struct tcf_net *tn = net_generic(net, tcf_net_id);
int err;
return idr_alloc_u32(&tn->idr, block, &block->index, block->index,
GFP_KERNEL);
idr_preload(GFP_KERNEL);
spin_lock(&tn->idr_lock);
err = idr_alloc_u32(&tn->idr, block, &block->index, block->index,
GFP_NOWAIT);
spin_unlock(&tn->idr_lock);
idr_preload_end();
return err;
}
static void tcf_block_remove(struct tcf_block *block, struct net *net)
{
struct tcf_net *tn = net_generic(net, tcf_net_id);
spin_lock(&tn->idr_lock);
idr_remove(&tn->idr, block->index);
spin_unlock(&tn->idr_lock);
}
static struct tcf_block *tcf_block_create(struct net *net, struct Qdisc *q,
@ -2278,6 +2288,7 @@ static __net_init int tcf_net_init(struct net *net)
{
struct tcf_net *tn = net_generic(net, tcf_net_id);
spin_lock_init(&tn->idr_lock);
idr_init(&tn->idr);
return 0;
}