diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c
index 25f6cca..bcd9719 100644
--- a/net/ipv6/mcast.c
+++ b/net/ipv6/mcast.c
@@ -793,10 +793,10 @@
 	}
 	spin_unlock_bh(&im->mca_lock);
 
-	write_lock_bh(&idev->mc_lock);
+	spin_lock_bh(&idev->mc_lock);
 	pmc->next = idev->mc_tomb;
 	idev->mc_tomb = pmc;
-	write_unlock_bh(&idev->mc_lock);
+	spin_unlock_bh(&idev->mc_lock);
 }
 
 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca)
@@ -804,7 +804,7 @@
 	struct ifmcaddr6 *pmc, *pmc_prev;
 	struct ip6_sf_list *psf, *psf_next;
 
-	write_lock_bh(&idev->mc_lock);
+	spin_lock_bh(&idev->mc_lock);
 	pmc_prev = NULL;
 	for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
 		if (ipv6_addr_equal(&pmc->mca_addr, pmca))
@@ -817,7 +817,8 @@
 		else
 			idev->mc_tomb = pmc->next;
 	}
-	write_unlock_bh(&idev->mc_lock);
+	spin_unlock_bh(&idev->mc_lock);
+
 	if (pmc) {
 		for (psf=pmc->mca_tomb; psf; psf=psf_next) {
 			psf_next = psf->sf_next;
@@ -832,10 +833,10 @@
 {
 	struct ifmcaddr6 *pmc, *nextpmc;
 
-	write_lock_bh(&idev->mc_lock);
+	spin_lock_bh(&idev->mc_lock);
 	pmc = idev->mc_tomb;
 	idev->mc_tomb = NULL;
-	write_unlock_bh(&idev->mc_lock);
+	spin_unlock_bh(&idev->mc_lock);
 
 	for (; pmc; pmc = nextpmc) {
 		nextpmc = pmc->next;
@@ -1696,7 +1697,7 @@
 	int type, dtype;
 
 	read_lock_bh(&idev->lock);
-	write_lock_bh(&idev->mc_lock);
+	spin_lock(&idev->mc_lock);
 
 	/* deleted MCA's */
 	pmc_prev = NULL;
@@ -1730,7 +1731,7 @@
 		} else
 			pmc_prev = pmc;
 	}
-	write_unlock_bh(&idev->mc_lock);
+	spin_unlock(&idev->mc_lock);
 
 	/* change recs */
 	for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
@@ -2311,7 +2312,7 @@
 void ipv6_mc_init_dev(struct inet6_dev *idev)
 {
 	write_lock_bh(&idev->lock);
-	rwlock_init(&idev->mc_lock);
+	spin_lock_init(&idev->mc_lock);
 	idev->mc_gq_running = 0;
 	setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
 			(unsigned long)idev);