From patchwork Wed Sep 12 05:25:53 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Li RongQing X-Patchwork-Id: 183249 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id A73CA2C007D for ; Wed, 12 Sep 2012 15:26:06 +1000 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752624Ab2ILF0E (ORCPT ); Wed, 12 Sep 2012 01:26:04 -0400 Received: from mail-pz0-f46.google.com ([209.85.210.46]:54876 "EHLO mail-pz0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751995Ab2ILF0D (ORCPT ); Wed, 12 Sep 2012 01:26:03 -0400 Received: by dady13 with SMTP id y13so741323dad.19 for ; Tue, 11 Sep 2012 22:26:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:subject:date:message-id:x-mailer; bh=0ZEusWSSWMVU3gIhRStMYbByuGI8nxE/5Br43hTPkr8=; b=tXH7b22jjezCSF765AEM36uM/x/jh7m9nYmyrqWBiXX/DGq9fOU3L3a+pxHl8MY0eP 9yGXTwLGnnGvRy2XIO5HNfYioKrqc8+YGWNDtYiW4DzP6o7uwhkWTRIR1lJc184WXJB2 Vjm531wq2Tay4wVqiX4RJO8+34vdb6oeChJMq+lQYCw9aoSyxz0F3CqI0oz7d/ecBOTN kF0QPbBK8MxuzEKAbmn7c2muZfonXdC91zRBQ05i7/qU9KfonOlJVcNRCGqPaK+ZYZfK QvFrP5zhuMHiATf/gaUMcqsgzmlSvQv2qzgxhz3pdmcL50bSOrOkxLAiBBYj9bJIYT/Y 32AQ== Received: by 10.68.226.132 with SMTP id rs4mr15426176pbc.75.1347427561892; Tue, 11 Sep 2012 22:26:01 -0700 (PDT) Received: from localhost ([61.148.56.138]) by mx.google.com with ESMTPS id rm6sm4698501pbc.54.2012.09.11.22.25.58 (version=TLSv1/SSLv3 cipher=OTHER); Tue, 11 Sep 2012 22:26:01 -0700 (PDT) From: roy.qing.li@gmail.com To: netdev@vger.kernel.org Subject: [PATCH] ipv6: replace write lock with read lock when get route info Date: Wed, 12 Sep 2012 13:25:53 +0800 Message-Id: <1347427553-17781-1-git-send-email-roy.qing.li@gmail.com> X-Mailer: git-send-email 1.7.4.1 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Li RongQing geting route info does not write rt->rt6i_table, so replace write lock with read lock Signed-off-by: Li RongQing --- net/ipv6/route.c | 8 ++++---- 1 files changed, 4 insertions(+), 4 deletions(-) diff --git a/net/ipv6/route.c b/net/ipv6/route.c index 399613b..8be1d86 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -1837,7 +1837,7 @@ static struct rt6_info *rt6_get_route_info(struct net *net, if (!table) return NULL; - write_lock_bh(&table->tb6_lock); + read_lock_bh(&table->tb6_lock); fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); if (!fn) goto out; @@ -1853,7 +1853,7 @@ static struct rt6_info *rt6_get_route_info(struct net *net, break; } out: - write_unlock_bh(&table->tb6_lock); + read_unlock_bh(&table->tb6_lock); return rt; } @@ -1896,7 +1896,7 @@ struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_dev if (!table) return NULL; - write_lock_bh(&table->tb6_lock); + read_lock_bh(&table->tb6_lock); for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) { if (dev == rt->dst.dev && ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && @@ -1905,7 +1905,7 @@ struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_dev } if (rt) dst_hold(&rt->dst); - write_unlock_bh(&table->tb6_lock); + read_unlock_bh(&table->tb6_lock); return rt; }