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ipv6: do not call ndisc_send_rs() with write lock

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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 <hannes@stressinduktion.org>
Signed-off-by: Cong Wang <amwang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Cong Wang 2013-08-31 13:44:32 +08:00 committed by David S. Miller
parent 034dfc5df9
commit caf92bc400
1 changed files with 7 additions and 3 deletions
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10
net/ipv6/addrconf.c
View file

@ -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);
}