diff options
| author | Vlad Buslov <vladbu@mellanox.com> | 2018-07-05 16:24:32 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-07-08 05:42:29 +0200 |
| commit | 0190c1d452a91c38a3462abdd81752be1b9006a8 (patch) | |
| tree | 861605e9fbe0db5ba1ef8a518cc0bca96d04f4fb /net/sched/act_skbmod.c | |
| parent | net: sched: use reference counting action init (diff) | |
| download | linux-0190c1d452a91c38a3462abdd81752be1b9006a8.tar.xz linux-0190c1d452a91c38a3462abdd81752be1b9006a8.zip | |
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_skbmod.c')
| -rw-r--r-- | net/sched/act_skbmod.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/net/sched/act_skbmod.c b/net/sched/act_skbmod.c index e844381af066..cdc6bacfb190 100644 --- a/net/sched/act_skbmod.c +++ b/net/sched/act_skbmod.c @@ -128,21 +128,28 @@ static int tcf_skbmod_init(struct net *net, struct nlattr *nla, if (parm->flags & SKBMOD_F_SWAPMAC) lflags = SKBMOD_F_SWAPMAC; - exists = tcf_idr_check(tn, parm->index, a, bind); + err = tcf_idr_check_alloc(tn, &parm->index, a, bind); + if (err < 0) + return err; + exists = err; if (exists && bind) return 0; if (!lflags) { if (exists) tcf_idr_release(*a, bind); + else + tcf_idr_cleanup(tn, parm->index); return -EINVAL; } if (!exists) { ret = tcf_idr_create(tn, parm->index, est, a, &act_skbmod_ops, bind, true); - if (ret) + if (ret) { + tcf_idr_cleanup(tn, parm->index); return ret; + } ret = ACT_P_CREATED; } else if (!ovr) { |