[SRU][Artful][PATCH 0/2][v2] Fixes for LP:1746474

[Joseph Salisbury]

BugLink: http://bugs.launchpad.net/bugs/1746474

== SRU Justification ==
Commit 52df157f17e5 introduced a regression in v4.13-rc1.  This regression
causes a stack trace to occur when tearing down an LXD container.  The process
hangs with the following message:

"unregister_netdevice: waiting for eth0 to become free. Usage count = 5"

This regression is fixed by commit 510c321b5571, which is in mainline as of
v4.16-rc7.  The fix is needed in Artful and Bionic.  However, Artful needs
commit 9620fef27ed2 as a prereq commit, so it's SRU request es beinsss sent separately.


== Fixes ==
9620fef27ed2 ("ipv4: convert dst_metrics.refcnt from atomic_t to refcount_t")
510c321b5571 ("xfrm: reuse uncached_list to track xdsts")

== Regression Potential ==
Low.  This commit is to fix a current regression.

== Test Case ==
A test kernel was built with these patches and tested by the original bug reporter.
The bug reporter states the test kernel resolved the bug.

Eric Dumazet (1):
  ipv4: convert dst_metrics.refcnt from atomic_t to refcount_t

Xin Long (1):
  xfrm: reuse uncached_list to track xdsts

 include/net/dst.h        |  3 ++-
 include/net/ip6_route.h  | 13 +++++++++++++
 include/net/route.h      |  3 +++
 net/core/dst.c           |  6 +++---
 net/ipv4/fib_semantics.c |  4 ++--
 net/ipv4/route.c         | 23 ++++++++++++++---------
 net/ipv4/xfrm4_policy.c  |  4 +++-
 net/ipv6/route.c         |  4 ++--
 net/ipv6/xfrm6_policy.c  |  4 ++++
 9 files changed, 46 insertions(+), 18 deletions(-)

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2.7.4