From caf92bc4007036cfac8ee06c845fdfe6496e4fb3 Mon Sep 17 00:00:00 2001 From: Cong Wang Date: Sat, 31 Aug 2013 13:44:32 +0800 Subject: [PATCH] ipv6: do not call ndisc_send_rs() with write lock 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. Reviewed-by: Hannes Frederic Sowa Signed-off-by: Cong Wang Signed-off-by: David S. Miller --- net/ipv6/addrconf.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c index 619451336bf1..baaaead69ee1 100644 --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -3090,6 +3090,7 @@ 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); @@ -3104,12 +3105,14 @@ 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) ? @@ -3125,6 +3128,7 @@ static void addrconf_rs_timer(unsigned long data) out: write_unlock(&idev->lock); +put: in6_dev_put(idev); } -- 2.39.5