* patch inclusion in lts trees
@ 2019-08-19 11:29 Madalin-cristian Bucur
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From: Madalin-cristian Bucur @ 2019-08-19 11:29 UTC (permalink / raw)
To: fw, steffen.klassert; +Cc: netdev
Hi Florian, Steffen,
the fix below, addressing a problem from kernel v4.9, did not get picked
up in the lts trees, is there a reason for this? Are there more such fixes
that were left out?
Thank you,
Madalin
commit 7a474c36586f4277f930ab7e6865c97e44dfc3bc
Author: Florian Westphal <fw@strlen.de>
Date: Fri Jan 4 14:17:01 2019 +0100
xfrm: policy: increment xfrm_hash_generation on hash rebuild
Hash rebuild will re-set all the inexact entries, then re-insert them.
Lookups that can occur in parallel will therefore not find any policies.
This was safe when lookups were still guarded by rwlock.
After rcu-ification, lookups check the hash_generation seqcount to detect
when a hash resize takes place. Hash rebuild missed the needed increment.
Hash resizes and hash rebuilds cannot occur in parallel (both acquire
hash_resize_mutex), so just increment xfrm_hash_generation, like resize.
Fixes: a7c44247f704e3 ("xfrm: policy: make xfrm_policy_lookup_bytype lockless")
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
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