xfrm: state: use atomic_inc_not_zero to increment refcount

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Once xfrm_state_lookup_byaddr no longer acquires the state lock another
cpu might be freeing the state entry at the same time.

To detect this we use atomic_inc_not_zero, we then signal -EAGAIN to
caller in case our result was stale.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

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Florian Westphal 2016-08-09 12:16:05 +02:00 • committed by Steffen Klassert

parent ae3fb6d321

commit 02efdff7e2

1 changed files with 16 additions and 5 deletions

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net/xfrm/xfrm_state.c

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