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Date:	Sun, 29 Sep 2013 13:41:34 -0700
From:	Salam Noureddine <>
To:	"David S. Miller" <>,
	Alexey Kuznetsov <>,
	James Morris <>,
	Hideaki YOSHIFUJI <>,
	Patrick McHardy <>,
Cc:	Salam Noureddine <>
Subject: [PATCH 2/2] ipv6 mcast: use in6_dev_put in timer handlers instead of __in6_dev_put

It is possible for the timer handlers to run after the call to
ipv6_mc_down so use in6_dev_put instead of __in6_dev_put in the
handler function in order to do proper cleanup when the refcnt
reaches 0. Otherwise, the refcnt can reach zero without the
inet6_dev being destroyed and we end up leaking a reference to
the net_device and see messages like the following,

unregister_netdevice: waiting for eth0 to become free. Usage count = 1

Tested on linux-3.4.43.

Signed-off-by: Salam Noureddine <>
 net/ipv6/mcast.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c
index 096cd67..d18f9f9 100644
--- a/net/ipv6/mcast.c
+++ b/net/ipv6/mcast.c
@@ -2034,7 +2034,7 @@ static void mld_dad_timer_expire(unsigned long data)
 		if (idev->mc_dad_count)
 			mld_dad_start_timer(idev, idev->mc_maxdelay);
-	__in6_dev_put(idev);
+	in6_dev_put(idev);
 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
@@ -2379,7 +2379,7 @@ static void mld_gq_timer_expire(unsigned long data)
 	idev->mc_gq_running = 0;
 	mld_send_report(idev, NULL);
-	__in6_dev_put(idev);
+	in6_dev_put(idev);
 static void mld_ifc_timer_expire(unsigned long data)
@@ -2392,7 +2392,7 @@ static void mld_ifc_timer_expire(unsigned long data)
 		if (idev->mc_ifc_count)
 			mld_ifc_start_timer(idev, idev->mc_maxdelay);
-	__in6_dev_put(idev);
+	in6_dev_put(idev);
 static void mld_ifc_event(struct inet6_dev *idev)

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