[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 <[EMAIL PROTECTED]>
---
commit 8d28b6a3d70b6c98bba6d1e60e2ecf8eb9fbbb2b
tree e363ea54f7b22a3cbd47e032c5fed1b1edb7d53c
parent 8373a426e9d692f74d10867c2dc3ea332e09154c
author Patrick McHardy <[EMAIL PROTECTED]> Mon, 16 Apr 2007 09:05:24 +0200
committer Patrick McHardy <[EMAIL PROTECTED]> Mon, 16 Apr 2007 09:05:24 +0200
net/core/rtnetlink.c | 8 ++++++--
1 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 648a7b6..62f5c7f 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -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);
-
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