netdev - Re: netns: use a spin_lock to protect nsid management

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Message-ID: <55533C61.2030206@6wind.com>
Date:	Wed, 13 May 2015 13:58:25 +0200
From:	Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:	Cong Wang <xiyou.wangcong@...il.com>,
	Dan Carpenter <dan.carpenter@...cle.com>
CC:	kernel-janitors@...r.kernel.org,
	Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: netns: use a spin_lock to protect nsid management

Le 12/05/2015 21:16, Cong Wang a écrit :
[snip]
> Also why do we have to disable IRQ when holding the spinlock?
> IOW, which case takes the spin lock in IRQ context?
peernet2id() is called by do_one_broadcast() (net/netlink/af_netlink.c). So
every callers of netlink_broadcast[_filtered]()/nlmsg_unicast()
/nlmsg_multicast() may needs this lock.
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