linux-kernel - [PATCH v1 6/6] sctp: convert sctp_assoc_set_id to use idr_alloc

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Date:	Wed, 27 Mar 2013 09:18:08 -0400
From:	Jeff Layton <jlayton@...hat.com>
To:	akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, tj@...nel.org,
	Vlad Yasevich <vyasevich@...il.com>,
	Sridhar Samudrala <sri@...ibm.com>,
	Neil Horman <nhorman@...driver.com>,
	"David S. Miller" <davem@...emloft.net>,
	linux-sctp@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH v1 6/6] sctp: convert sctp_assoc_set_id to use idr_alloc_cyclic

(Note: compile-tested only)

Signed-off-by: Jeff Layton <jlayton@...hat.com>
Cc: Vlad Yasevich <vyasevich@...il.com>
Cc: Sridhar Samudrala <sri@...ibm.com>
Cc: Neil Horman <nhorman@...driver.com>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: linux-sctp@...r.kernel.org
Cc: netdev@...r.kernel.org
---
 net/sctp/associola.c | 15 +--------------
 net/sctp/protocol.c  |  2 +-
 2 files changed, 2 insertions(+), 15 deletions(-)

diff --git a/net/sctp/associola.c b/net/sctp/associola.c
index d2709e2..8b21563 100644
--- a/net/sctp/associola.c
+++ b/net/sctp/associola.c
@@ -66,13 +66,6 @@ static void sctp_assoc_bh_rcv(struct work_struct *work);
 static void sctp_assoc_free_asconf_acks(struct sctp_association *asoc);
 static void sctp_assoc_free_asconf_queue(struct sctp_association *asoc);
 
-/* Keep track of the new idr low so that we don't re-use association id
- * numbers too fast.  It is protected by they idr spin lock is in the
- * range of 1 - INT_MAX.
- */
-static u32 idr_low = 1;
-
-
 /* 1st Level Abstractions. */
 
 /* Initialize a new association from provided memory. */
@@ -1601,13 +1594,7 @@ int sctp_assoc_set_id(struct sctp_association *asoc, gfp_t gfp)
 	if (preload)
 		idr_preload(gfp);
 	spin_lock_bh(&sctp_assocs_id_lock);
-	/* 0 is not a valid id, idr_low is always >= 1 */
-	ret = idr_alloc(&sctp_assocs_id, asoc, idr_low, 0, GFP_NOWAIT);
-	if (ret >= 0) {
-		idr_low = ret + 1;
-		if (idr_low == INT_MAX)
-			idr_low = 1;
-	}
+	ret = idr_alloc_cyclic(&sctp_assocs_id, asoc, 1, 0, GFP_NOWAIT);
 	spin_unlock_bh(&sctp_assocs_id_lock);
 	if (preload)
 		idr_preload_end();
diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c
index 1c2e46c..bc7b069 100644
--- a/net/sctp/protocol.c
+++ b/net/sctp/protocol.c
@@ -1352,7 +1352,7 @@ SCTP_STATIC __init int sctp_init(void)
 	sctp_max_outstreams   		= SCTP_DEFAULT_OUTSTREAMS;
 
 	/* Initialize handle used for association ids. */
-	idr_init(&sctp_assocs_id);
+	idr_init_cyclic(&sctp_assocs_id, 1);
 
 	limit = nr_free_buffer_pages() / 8;
 	limit = max(limit, 128UL);
-- 
1.7.11.7

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