diff options
| author | Vlad Buslov <vladbu@mellanox.com> | 2018-07-05 17:24:32 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-07-08 12:42:29 +0900 |
| commit | 0190c1d452a91c38a3462abdd81752be1b9006a8 (patch) | |
| tree | 861605e9fbe0db5ba1ef8a518cc0bca96d04f4fb /net/sched/act_pedit.c | |
| parent | cae422f379f37fe9105d2a113259788f989e7df5 (diff) | |
net: sched: atomically check-allocate action
Implement function that atomically checks if action exists and either takes
reference to it, or allocates idr slot for action index to prevent
concurrent allocations of actions with same index. Use EBUSY error pointer
to indicate that idr slot is reserved.
Implement cleanup helper function that removes temporary error pointer from
idr. (in case of error between idr allocation and insertion of newly
created action to specified index)
Refactor all action init functions to insert new action to idr using this
API.
Reviewed-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: Vlad Buslov <vladbu@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched/act_pedit.c')
| -rw-r--r-- | net/sched/act_pedit.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/net/sched/act_pedit.c b/net/sched/act_pedit.c index 3a0e2f762f4e..cc8ffcd1ddb5 100644 --- a/net/sched/act_pedit.c +++ b/net/sched/act_pedit.c @@ -173,16 +173,20 @@ static int tcf_pedit_init(struct net *net, struct nlattr *nla, if (IS_ERR(keys_ex)) return PTR_ERR(keys_ex); - if (!tcf_idr_check(tn, parm->index, a, bind)) { + err = tcf_idr_check_alloc(tn, &parm->index, a, bind); + if (!err) { if (!parm->nkeys) { + tcf_idr_cleanup(tn, parm->index); NL_SET_ERR_MSG_MOD(extack, "Pedit requires keys to be passed"); ret = -EINVAL; goto out_free; } ret = tcf_idr_create(tn, parm->index, est, a, &act_pedit_ops, bind, false); - if (ret) + if (ret) { + tcf_idr_cleanup(tn, parm->index); goto out_free; + } p = to_pedit(*a); keys = kmalloc(ksize, GFP_KERNEL); if (!keys) { @@ -191,7 +195,7 @@ static int tcf_pedit_init(struct net *net, struct nlattr *nla, goto out_free; } ret = ACT_P_CREATED; - } else { + } else if (err > 0) { if (bind) goto out_free; if (!ovr) { @@ -207,6 +211,8 @@ static int tcf_pedit_init(struct net *net, struct nlattr *nla, goto out_free; } } + } else { + return err; } spin_lock_bh(&p->tcf_lock); |