From 1c2d670f3660e9103fdcdca702f6dbf8ea7d6afb Mon Sep 17 00:00:00 2001 From: Patrick McHardy Date: Mon, 16 Apr 2007 16:59:10 -0700 Subject: [PATCH] [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 Signed-off-by: David S. Miller --- net/core/rtnetlink.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index 648a7b6d15df..62f5c7f98d17 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); -- GitLab