From: Matthew Wilcox <mawil...@microsoft.com>
Commit e7614370d6f0 ("net_sched: use idr to allocate u32 filter handles)
converted htid allocation to use the IDR. The ID allocated by this
scheme changes; it used to be cyclic, but now always allocates the
lowest available. The IDR supports cyclic allocation, so just use
the right function.
Signed-off-by: Matthew Wilcox <mawil...@microsoft.com>
---
net/sched/cls_u32.c | 14 ++++----------
1 file changed, 4 insertions(+), 10 deletions(-)
diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
index 9d48674a70e0..e65b47483dc0 100644
--- a/net/sched/cls_u32.c
+++ b/net/sched/cls_u32.c
@@ -316,19 +316,13 @@ static void *u32_get(struct tcf_proto *tp, u32 handle)
return u32_lookup_key(ht, handle);
}
+/* Protected by rtnl lock */
static u32 gen_new_htid(struct tc_u_common *tp_c, struct tc_u_hnode *ptr)
{
- unsigned long idr_index;
- int err;
-
- /* This is only used inside rtnl lock it is safe to increment
- * without read _copy_ update semantics
- */
- err = idr_alloc_ext(&tp_c->handle_idr, ptr, &idr_index,
- 1, 0x7FF, GFP_KERNEL);
- if (err)
+ int id = idr_alloc_cyclic(&tp_c->handle_idr, ptr, 1, 0x7FF, GFP_KERNEL);
+ if (id < 0)
return 0;
- return (u32)(idr_index | 0x800) << 20;
+ return (id | 0x800U) << 20;
}
static struct hlist_head *tc_u_common_hash;
--
2.15.0
