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authorDaniel Borkmann <dborkman@redhat.com>2013-08-20 14:22:00 +0400
committerDavid S. Miller <davem@davemloft.net>2013-08-21 10:52:02 +0400
commit846989635b368c41efd9079ec6fe0e8d2845ec11 (patch)
tree282a9eacb2f268ef50d4c769078157b10a5c3877 /net/ipv6/mcast.c
parentd8a64420eb267bec9f4c99627deee4fa3bf4133e (diff)
downloadlinux-846989635b368c41efd9079ec6fe0e8d2845ec11.tar.xz
net: ipv6: igmp6_event_query: use msecs_to_jiffies
Use proper API functions to calculate jiffies from milliseconds and not the crude method of dividing HZ by a value. This ensures more accurate values even in the case of strange HZ values. While at it, also simplify code in the mlh2 case by using max(). Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/mcast.c')
-rw-r--r--net/ipv6/mcast.c11
1 files changed, 5 insertions, 6 deletions
diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c
index 6c76df9909bf..57863e206d56 100644
--- a/net/ipv6/mcast.c
+++ b/net/ipv6/mcast.c
@@ -1150,9 +1150,7 @@ int igmp6_event_query(struct sk_buff *skb)
int switchback;
/* MLDv1 router present */
- /* Translate milliseconds to jiffies */
- max_delay = (ntohs(mld->mld_maxdelay)*HZ)/1000;
-
+ max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
switchback = (idev->mc_qrv + 1) * max_delay;
idev->mc_v1_seen = jiffies + switchback;
@@ -1169,10 +1167,11 @@ int igmp6_event_query(struct sk_buff *skb)
return -EINVAL;
mlh2 = (struct mld2_query *)skb_transport_header(skb);
- max_delay = (MLDV2_MRC(ntohs(mlh2->mld2q_mrc))*HZ)/1000;
- if (!max_delay)
- max_delay = 1;
+
+ max_delay = max(msecs_to_jiffies(MLDV2_MRC(ntohs(mlh2->mld2q_mrc))), 1UL);
+
idev->mc_maxdelay = max_delay;
+
if (mlh2->mld2q_qrv)
idev->mc_qrv = mlh2->mld2q_qrv;
if (group_type == IPV6_ADDR_ANY) { /* general query */