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authorVlad Buslov <vladbu@mellanox.com>2018-07-05 17:24:32 +0300
committerDavid S. Miller <davem@davemloft.net>2018-07-08 06:42:29 +0300
commit0190c1d452a91c38a3462abdd81752be1b9006a8 (patch)
tree861605e9fbe0db5ba1ef8a518cc0bca96d04f4fb /net/sched/act_simple.c
parentcae422f379f37fe9105d2a113259788f989e7df5 (diff)
downloadlinux-0190c1d452a91c38a3462abdd81752be1b9006a8.tar.xz
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_simple.c')
-rw-r--r--net/sched/act_simple.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/net/sched/act_simple.c b/net/sched/act_simple.c
index 2da47c682a30..aa51152e0066 100644
--- a/net/sched/act_simple.c
+++ b/net/sched/act_simple.c
@@ -100,21 +100,28 @@ static int tcf_simp_init(struct net *net, struct nlattr *nla,
return -EINVAL;
parm = nla_data(tb[TCA_DEF_PARMS]);
- 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 (tb[TCA_DEF_DATA] == NULL) {
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_simp_ops, bind, false);
- if (ret)
+ if (ret) {
+ tcf_idr_cleanup(tn, parm->index);
return ret;
+ }
d = to_defact(*a);
ret = alloc_defdata(d, tb[TCA_DEF_DATA]);