From: David S. Miller <davem@davemloft.net>
Date: Mon, 17 Aug 2015 21:28:04 +0000 (-0700)
Subject: Merge branch 'ipv6_percpu_rt_deadlock'
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=1f979b117b17978b70f20bd981f0791012b1cddf;p=openwrt%2Fstaging%2Fblogic.git

Merge branch 'ipv6_percpu_rt_deadlock'

Martin KaFai Lau says:

====================
ipv6: Fix a potential deadlock when creating pcpu rt

v1 -> v2:
A minor change in the commit message of patch 2.

This patch series fixes a potential deadlock when creating a pcpu rt.
It happens when dst_alloc() decided to run gc. Something like this:

read_lock(&table->tb6_lock);
ip6_rt_pcpu_alloc()
=> dst_alloc()
=> ip6_dst_gc()
=> write_lock(&table->tb6_lock); /* oops */

Patch 1 and 2 are some prep works.
Patch 3 is the fix.

Original report: https://bugzilla.kernel.org/show_bug.cgi?id=102291
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
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1f979b117b17978b70f20bd981f0791012b1cddf