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authorMatthew Wilcox <mawilcox@microsoft.com>2017-11-28 12:05:54 -0500
committerMatthew Wilcox <mawilcox@microsoft.com>2018-02-06 16:41:27 -0500
commitffdc2d9e1afd20e9f9d205115661481e984542d6 (patch)
treeaa224291034eed97a7686c6ae81b4846a800dbcb /net
parent85bd0438a249e7a7a0622e0b0b6663595fadcc27 (diff)
downloadlinux-ffdc2d9e1afd20e9f9d205115661481e984542d6.tar.bz2
cls_u32: Reinstate cyclic allocation
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 <mawilcox@microsoft.com>
Diffstat (limited to 'net')
-rw-r--r--net/sched/cls_u32.c14
1 files changed, 4 insertions, 10 deletions
diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
index 5b256da985b1..d2805f24ddd3 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;