netdev - [PATCH 1/2] Revert "genetlink: fix family dump race"

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Date:	Wed, 21 Aug 2013 16:08:02 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	netdev@...r.kernel.org
Cc:	Thomas Graf <tgraf@...g.ch>,
	Johannes Berg <johannes.berg@...el.com>
Subject: [PATCH 1/2] Revert "genetlink: fix family dump race"

From: Johannes Berg <johannes.berg@...el.com>

This reverts commit 58ad436fcf49810aa006016107f494c9ac9013db.

It turns out that the change introduced a potential deadlock
by causing a locking dependency with netlink's cb_mutex. I
can't seem to find a way to resolve this without doing major
changes to the locking, so revert this.

Signed-off-by: Johannes Berg <johannes.berg@...el.com>
---
 net/netlink/genetlink.c | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c
index f85f8a2..512718a 100644
--- a/net/netlink/genetlink.c
+++ b/net/netlink/genetlink.c
@@ -789,10 +789,6 @@ static int ctrl_dumpfamily(struct sk_buff *skb, struct netlink_callback *cb)
 	struct net *net = sock_net(skb->sk);
 	int chains_to_skip = cb->args[0];
 	int fams_to_skip = cb->args[1];
-	bool need_locking = chains_to_skip || fams_to_skip;
-
-	if (need_locking)
-		genl_lock();
 
 	for (i = chains_to_skip; i < GENL_FAM_TAB_SIZE; i++) {
 		n = 0;
@@ -814,9 +810,6 @@ errout:
 	cb->args[0] = i;
 	cb->args[1] = n;
 
-	if (need_locking)
-		genl_unlock();
-
 	return skb->len;
 }
 
-- 
1.8.4.rc2

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