netdev - [PATCH 2/7] ieee802154: add locking for seq numbers

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Message-Id: <1253052785-26190-3-git-send-email-dbaryshkov@gmail.com>
Date:	Wed, 16 Sep 2009 02:13:00 +0400
From:	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	linux-zigbee-devel@...ts.sourceforge.net,
	Sergey Lapin <slapin@...fans.org>, netdev@...r.kernel.org
Subject: [PATCH 2/7] ieee802154: add locking for seq numbers

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@...il.com>
---
 net/ieee802154/netlink.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/net/ieee802154/netlink.c b/net/ieee802154/netlink.c
index 2106ecb..ca767bd 100644
--- a/net/ieee802154/netlink.c
+++ b/net/ieee802154/netlink.c
@@ -35,6 +35,7 @@
 #include <net/ieee802154_netdev.h>
 
 static unsigned int ieee802154_seq_num;
+static DEFINE_SPINLOCK(ieee802154_seq_lock);
 
 static struct genl_family ieee802154_coordinator_family = {
 	.id		= GENL_ID_GENERATE,
@@ -57,12 +58,15 @@ static struct sk_buff *ieee802154_nl_create(int flags, u8 req)
 {
 	void *hdr;
 	struct sk_buff *msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
+	unsigned long f;
 
 	if (!msg)
 		return NULL;
 
+	spin_lock_irqsave(&ieee802154_seq_lock, f);
 	hdr = genlmsg_put(msg, 0, ieee802154_seq_num++,
 			&ieee802154_coordinator_family, flags, req);
+	spin_unlock_irqrestore(&ieee802154_seq_lock, f);
 	if (!hdr) {
 		nlmsg_free(msg);
 		return NULL;
-- 
1.6.3.3

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