netdev - Re: [PATCH] xfrm: don't call xfrm_policy_cache_flush under xfrm_state

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Message-ID: <20170927123103.GB14971@breakpoint.cc>
Date:   Wed, 27 Sep 2017 14:31:03 +0200
From:   Florian Westphal <fw@...len.de>
To:     Artem Savkov <asavkov@...hat.com>
Cc:     Florian Westphal <fw@...len.de>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] xfrm: don't call xfrm_policy_cache_flush under
 xfrm_state_lock

Artem Savkov <asavkov@...hat.com> wrote:
> I might be wrong but it doesn't look like xfrm_state_lock is required
> for xfrm_policy_cache_flush and calling it under this lock triggers both
> "sleeping function called from invalid context" and "possible circular
> locking dependency detected" warnings on flush.
> 
> Fixes: ec30d78c14a8 xfrm: add xdst pcpu cache
> Signed-off-by: Artem Savkov <asavkov@...hat.com>

You're right, its not needed (and wrong).

Acked-by: Florian Westphal <fw@...len.de>