cls_u32: Reinstate cyclic allocation

Web:        https://git.kernel.org/torvalds/c/ffdc2d9e1afd20e9f9d205115661481e984542d6
Commit:     ffdc2d9e1afd20e9f9d205115661481e984542d6
Parent:     85bd0438a249e7a7a0622e0b0b6663595fadcc27
Refname:    refs/heads/master
Author:     Matthew Wilcox <[email protected]>
AuthorDate: Tue Nov 28 12:05:54 2017 -0500
Committer:  Matthew Wilcox <[email protected]>
CommitDate: Tue Feb 6 16:41:27 2018 -0500

    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 <[email protected]>
---
 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 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;