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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>
This commit is contained in:
Daniel Borkmann 2013-08-20 12:22:00 +02:00 committed by David S. Miller
parent d8a64420eb
commit 846989635b
1 changed files with 5 additions and 6 deletions
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11
net/ipv6/mcast.c
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@ -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 */