linux-kernel - RE: [PATCH next] netlink: prevent deadlock in ctrl

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Date:	Tue, 20 Aug 2013 14:03:25 +0000
From:	"Berg, Johannes" <johannes.berg@...el.com>
To:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
	"David S. Miller" <davem@...emloft.net>
CC:	Patrick McHardy <kaber@...sh.net>,
	Pablo Neira Ayuso <pablo@...filter.org>,
	Gao feng <gaofeng@...fujitsu.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH next] netlink: prevent deadlock in ctrl_dumpfamily()

> +	if (need_locking) {
> +		/* genl_mutex could be already locked in genl_rcv_msg() */
> +		rt = genl_family_find_byid(cb->nlh->nlmsg_type);
> +		need_locking = need_locking && rt->parallel_ops;
> +	}

This is equivalent to reverting the patch because parallel_ops will be false for the genl family. :-)

johannes
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