From mboxrd@z Thu Jan 1 00:00:00 1970 From: Cong Wang Subject: [PATCH net-next v10 05/11] ipv6: do not call ndisc_send_rs() with write lock Date: Wed, 28 Aug 2013 13:22:53 +0800 Message-ID: <1377667379-2315-6-git-send-email-amwang@redhat.com> References: <1377667379-2315-1-git-send-email-amwang@redhat.com> Cc: "David S. Miller" , Cong Wang To: netdev@vger.kernel.org Return-path: Received: from mx1.redhat.com ([209.132.183.28]:49717 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752669Ab3H1FX7 (ORCPT ); Wed, 28 Aug 2013 01:23:59 -0400 In-Reply-To: <1377667379-2315-1-git-send-email-amwang@redhat.com> Sender: netdev-owner@vger.kernel.org List-ID: From: Cong Wang Because vxlan module will call ip6_dst_lookup() in TX path, which will hold write lock. So we have to release this write lock before calling ndisc_send_rs(), otherwise could deadlock. Signed-off-by: Cong Wang --- net/ipv6/addrconf.c | 10 +++++++--- 1 files changed, 7 insertions(+), 3 deletions(-) diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c index 8e68466..1bb0861 100644 --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -3088,6 +3088,7 @@ static int addrconf_ifdown(struct net_device *dev, int how) static void addrconf_rs_timer(unsigned long data) { struct inet6_dev *idev = (struct inet6_dev *)data; + struct net_device *dev = idev->dev; struct in6_addr lladdr; write_lock(&idev->lock); @@ -3102,12 +3103,14 @@ static void addrconf_rs_timer(unsigned long data) goto out; if (idev->rs_probes++ < idev->cnf.rtr_solicits) { - if (!__ipv6_get_lladdr(idev, &lladdr, IFA_F_TENTATIVE)) - ndisc_send_rs(idev->dev, &lladdr, + write_unlock(&idev->lock); + if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) + ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); else - goto out; + goto put; + write_lock(&idev->lock); /* The wait after the last probe can be shorter */ addrconf_mod_rs_timer(idev, (idev->rs_probes == idev->cnf.rtr_solicits) ? @@ -3123,6 +3126,7 @@ static void addrconf_rs_timer(unsigned long data) out: write_unlock(&idev->lock); +put: in6_dev_put(idev); } -- 1.7.7.6