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[RTNETLINK]: Hold rtnl_mutex during netlink dump callbacks 

Hold rtnl_mutex during the entire netlink dump operation. This allows
to simplify locking in the dump callbacks, since they can now rely on
that no concurrent changes happen.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2007-04-16 16:59:10 -07:00 committed by David S. Miller
parent af65bdfce9
commit 1c2d670f36
1 changed files with 6 additions and 2 deletions
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8
net/core/rtnetlink.c
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@ -859,6 +859,7 @@ static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
int min_len;
int family;
int type;
int err;
type = nlh->nlmsg_type;
if (type > RTM_MAX)
@ -887,7 +888,10 @@ static int rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
if (dumpit == NULL)
return -EOPNOTSUPP;
return netlink_dump_start(rtnl, skb, nlh, dumpit, NULL);
__rtnl_unlock();
err = netlink_dump_start(rtnl, skb, nlh, dumpit, NULL);
rtnl_lock();
return err;
}
memset(rta_buf, 0, (rtattr_max * sizeof(struct rtattr *)));
@ -972,7 +976,7 @@ void __init rtnetlink_init(void)
panic("rtnetlink_init: cannot allocate rta_buf\n");
rtnl = netlink_kernel_create(NETLINK_ROUTE, RTNLGRP_MAX, rtnetlink_rcv,
NULL, THIS_MODULE);
&rtnl_mutex, THIS_MODULE);
if (rtnl == NULL)
panic("rtnetlink_init: cannot initialize rtnetlink\n");
netlink_set_nonroot(NETLINK_ROUTE, NL_NONROOT_RECV);