ACK, thanks Sachin!
> From:
> Sachin Sant <sachinp@xxxxxxxxxx>
> To:
> netdev@xxxxxxxxxxxxxxx,
> davem@xxxxxxxxxxxxx
> Cc:
> Sachin Sant <sachinp@xxxxxxxxxx>,
> linux-s390@xxxxxxxxxxxxxxx,
> linux-next@xxxxxxxxxxxxxxx, Ursula
> Braun1/Germany/IBM@IBMDE,
> eric.dumazet@xxxxxxxxx
> Date:
> 19.11.2010 10:40
> Subject:
> [Patch V2 -next] Adapt s390 qeth &
> lcs driver code to use 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.
>
> Signed-off-by : Sachin Sant <sachinp@xxxxxxxxxx>
> ---
>
> V2 : Changes based on suggestions given by Eric Dumazet
>
> diff -Naurp a/drivers/s390/net/lcs.c b/drivers/s390/net/lcs.c
> --- a/drivers/s390/net/lcs.c 2010-11-19
> 14:37:10.000000000 +0530
> +++ b/drivers/s390/net/lcs.c 2010-11-19
> 15:03:52.000000000 +0530
> @@ -1188,7 +1188,7 @@ lcs_remove_mc_addresses(struct lcs_card
> 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 +1233,7 @@ lcs_set_mc_addresses(struct lcs_card *ca
> 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;
> 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 +1269,10 @@ 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 -Naurp a/drivers/s390/net/qeth_l3_main.c
> b/drivers/s390/net/qeth_l3_main.c
> --- a/drivers/s390/net/qeth_l3_main.c 2010-11-19
> 14:37:10.000000000 +0530
> +++ b/drivers/s390/net/qeth_l3_main.c 2010-11-19
> 15:03:32.000000000 +0530
> @@ -1796,7 +1796,7 @@ static void qeth_l3_add_mc(struct qeth_c
> 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 +1828,9 @@ static void qeth_l3_add_vlan_mc(struct q
> 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 +1843,10 @@ static void qeth_l3_add_multicast_ipv4(s
> 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);
> }
>
>
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