linux-kernel - [PATCH 12/17] cls_flower: Convert to idr_alloc

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Message-Id: <20171128213312.28983-13-willy@infradead.org>
Date:   Tue, 28 Nov 2017 13:33:07 -0800
From:   Matthew Wilcox <willy@...radead.org>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Matthew Wilcox <mawilcox@...rosoft.com>,
        Chris Mi <chrism@...lanox.com>, Jiri Pirko <jiri@...lanox.com>,
        "David S . Miller" <davem@...emloft.net>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Eric Biggers <ebiggers@...gle.com>,
        Lai Jiangshan <laijs@...fujitsu.com>,
        Tejun Heo <tj@...nel.org>, Rehas Sachdeva <aquannie@...il.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 12/17] cls_flower: Convert to idr_alloc_u32

From: Matthew Wilcox <mawilcox@...rosoft.com>

Use the new helper which saves a temporary variable and a few lines
of code.

Signed-off-by: Matthew Wilcox <mawilcox@...rosoft.com>
---
 net/sched/cls_flower.c | 26 ++++++++++----------------
 1 file changed, 10 insertions(+), 16 deletions(-)

diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
index ec0dc92f6104..77a7a3c883b7 100644
--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -858,7 +858,6 @@ static int fl_change(struct net *net, struct sk_buff *in_skb,
 	struct cls_fl_filter *fnew;
 	struct nlattr **tb;
 	struct fl_flow_mask mask = {};
-	unsigned long idr_index;
 	int err;
 
 	if (!tca[TCA_OPTIONS])
@@ -889,21 +888,17 @@ static int fl_change(struct net *net, struct sk_buff *in_skb,
 		goto errout;
 
 	if (!handle) {
-		err = idr_alloc_ext(&head->handle_idr, fnew, &idr_index,
-				    1, 0x80000000, GFP_KERNEL);
-		if (err)
-			goto errout;
-		fnew->handle = idr_index;
-	}
-
-	/* user specifies a handle and it doesn't exist */
-	if (handle && !fold) {
-		err = idr_alloc_ext(&head->handle_idr, fnew, &idr_index,
-				    handle, handle + 1, GFP_KERNEL);
-		if (err)
-			goto errout;
-		fnew->handle = idr_index;
+		handle = 1;
+		err = idr_alloc_u32(&head->handle_idr, fnew, &handle,
+					INT_MAX, GFP_KERNEL);
+	} else if (!fold) {
+		/* user specifies a handle and it doesn't exist */
+		err = idr_alloc_u32(&head->handle_idr, fnew, &handle,
+					handle, GFP_KERNEL);
 	}
+	if (err)
+		goto errout;
+	fnew->handle = handle;
 
 	if (tb[TCA_FLOWER_FLAGS]) {
 		fnew->flags = nla_get_u32(tb[TCA_FLOWER_FLAGS]);
@@ -957,7 +952,6 @@ static int fl_change(struct net *net, struct sk_buff *in_skb,
 	*arg = fnew;
 
 	if (fold) {
-		fnew->handle = handle;
 		idr_replace(&head->handle_idr, fnew, fnew->handle);
 		list_replace_rcu(&fold->list, &fnew->list);
 		tcf_unbind_filter(tp, &fold->res);
-- 
2.15.0