From mboxrd@z Thu Jan 1 00:00:00 1970 From: James Chapman Subject: [PATCH v3 08/12] netlink: Export genl_lock() API for use by modules Date: Tue, 30 Mar 2010 17:18:09 +0100 Message-ID: <20100330161808.9628.75837.stgit@bert.katalix.com> References: <20100330161725.9628.69994.stgit@bert.katalix.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit To: netdev@vger.kernel.org Return-path: Received: from katalix.com ([82.103.140.233]:51126 "EHLO mail.katalix.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753637Ab0C3QSA (ORCPT ); Tue, 30 Mar 2010 12:18:00 -0400 Received: from localhost (localhost.localdomain [127.0.0.1]) by mail.katalix.com (Postfix) with ESMTP id CAE18A620AD for ; Tue, 30 Mar 2010 17:18:19 +0100 (BST) Received: from mail.katalix.com ([127.0.0.1]) by localhost (mail.katalix.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id jfmdxbUIKNHr for ; Tue, 30 Mar 2010 17:18:14 +0100 (BST) Received: from bert.katalix.com (localhost.localdomain [127.0.0.1]) by mail.katalix.com (Postfix) with ESMTP id 21728A620A3 for ; Tue, 30 Mar 2010 17:18:09 +0100 (BST) In-Reply-To: <20100330161725.9628.69994.stgit@bert.katalix.com> Sender: netdev-owner@vger.kernel.org List-ID: This lets kernel modules which use genl netlink APIs serialize netlink processing. Signed-off-by: James Chapman Reviewed-by: Randy Dunlap --- include/linux/genetlink.h | 8 ++++++++ net/netlink/genetlink.c | 6 ++++-- 2 files changed, 12 insertions(+), 2 deletions(-) diff --git a/include/linux/genetlink.h b/include/linux/genetlink.h index b834ef6..61549b2 100644 --- a/include/linux/genetlink.h +++ b/include/linux/genetlink.h @@ -80,4 +80,12 @@ enum { #define CTRL_ATTR_MCAST_GRP_MAX (__CTRL_ATTR_MCAST_GRP_MAX - 1) +#ifdef __KERNEL__ + +/* All generic netlink requests are serialized by a global lock. */ +extern void genl_lock(void); +extern void genl_unlock(void); + +#endif /* __KERNEL__ */ + #endif /* __LINUX_GENERIC_NETLINK_H */ diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c index a4b6e14..a28fda7 100644 --- a/net/netlink/genetlink.c +++ b/net/netlink/genetlink.c @@ -20,15 +20,17 @@ static DEFINE_MUTEX(genl_mutex); /* serialization of message processing */ -static inline void genl_lock(void) +void genl_lock(void) { mutex_lock(&genl_mutex); } +EXPORT_SYMBOL(genl_lock); -static inline void genl_unlock(void) +void genl_unlock(void) { mutex_unlock(&genl_mutex); } +EXPORT_SYMBOL(genl_unlock); #define GENL_FAM_TAB_SIZE 16 #define GENL_FAM_TAB_MASK (GENL_FAM_TAB_SIZE - 1)