qeth lcs: convert mc rwlock to RCU

Commit 1d7138de878d1d4210727c1200193e69596f93b3
igmp: RCU conversion of in_dev->mc_list

converted rwlock to RCU.

Update the s390 network drivers(qeth & lcs) code to adapt to this change.
V2 : Changes based on suggestions given by Eric Dumazet

Signed-off-by: Sachin Sant <sachinp@in.ibm.com>
Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/s390/net/lcs.c b/drivers/s390/net/lcs.c
index 0f19d54..c9f13b9 100644 (file)
--- a/drivers/s390/net/lcs.c
+++ b/drivers/s390/net/lcs.c
@@ -1188,7 +1188,8 @@ lcs_remove_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
        spin_lock_irqsave(&card->ipm_lock, flags);
        list_for_each(l, &card->ipm_list) {
                ipm = list_entry(l, struct lcs_ipm_list, list);
-               for (im4 = in4_dev->mc_list; im4 != NULL; im4 = im4->next) {
+               for (im4 = rcu_dereference(in4_dev->mc_list);
+                    im4 != NULL; im4 = rcu_dereference(im4->next_rcu)) {
                        lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
                        if ( (ipm->ipm.ip_addr == im4->multiaddr) &&
                             (memcmp(buf, &ipm->ipm.mac_addr,
@@ -1233,7 +1234,8 @@ lcs_set_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
        unsigned long flags;
 
        LCS_DBF_TEXT(4, trace, "setmclst");
-       for (im4 = in4_dev->mc_list; im4; im4 = im4->next) {
+       for (im4 = rcu_dereference(in4_dev->mc_list); im4 != NULL;
+            im4 = rcu_dereference(im4->next_rcu)) {
                lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
                ipm = lcs_check_addr_entry(card, im4, buf);
                if (ipm != NULL)
@@ -1269,10 +1271,10 @@ lcs_register_mc_addresses(void *data)
        in4_dev = in_dev_get(card->dev);
        if (in4_dev == NULL)
                goto out;
-       read_lock(&in4_dev->mc_list_lock);
+       rcu_read_lock();
        lcs_remove_mc_addresses(card,in4_dev);
        lcs_set_mc_addresses(card, in4_dev);
-       read_unlock(&in4_dev->mc_list_lock);
+       rcu_read_unlock();
        in_dev_put(in4_dev);
 
        netif_carrier_off(card->dev);

diff --git a/drivers/s390/net/qeth_l3_main.c b/drivers/s390/net/qeth_l3_main.c
index 74d1401..65291db 100644 (file)
--- a/drivers/s390/net/qeth_l3_main.c
+++ b/drivers/s390/net/qeth_l3_main.c
@@ -1796,7 +1796,8 @@ static void qeth_l3_add_mc(struct qeth_card *card, struct in_device *in4_dev)
        char buf[MAX_ADDR_LEN];
 
        QETH_CARD_TEXT(card, 4, "addmc");
-       for (im4 = in4_dev->mc_list; im4; im4 = im4->next) {
+       for (im4 = rcu_dereference(in4_dev->mc_list); im4 != NULL;
+            im4 = rcu_dereference(im4->next_rcu)) {
                qeth_l3_get_mac_for_ipm(im4->multiaddr, buf, in4_dev->dev);
                ipm = qeth_l3_get_addr_buffer(QETH_PROT_IPV4);
                if (!ipm)
@@ -1828,9 +1829,9 @@ static void qeth_l3_add_vlan_mc(struct qeth_card *card)
                in_dev = in_dev_get(netdev);
                if (!in_dev)
                        continue;
-               read_lock(&in_dev->mc_list_lock);
+               rcu_read_lock();
                qeth_l3_add_mc(card, in_dev);
-               read_unlock(&in_dev->mc_list_lock);
+               rcu_read_unlock();
                in_dev_put(in_dev);
        }
 }
@@ -1843,10 +1844,10 @@ static void qeth_l3_add_multicast_ipv4(struct qeth_card *card)
        in4_dev = in_dev_get(card->dev);
        if (in4_dev == NULL)
                return;
-       read_lock(&in4_dev->mc_list_lock);
+       rcu_read_lock();
        qeth_l3_add_mc(card, in4_dev);
        qeth_l3_add_vlan_mc(card);
-       read_unlock(&in4_dev->mc_list_lock);
+       rcu_read_unlock();
        in_dev_put(in4_dev);
 }