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

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Message-ID: <20170928111232.GT3149@secunet.com>
Date:   Thu, 28 Sep 2017 13:12:32 +0200
From:   Steffen Klassert <steffen.klassert@...unet.com>
To:     Florian Westphal <fw@...len.de>
CC:     Artem Savkov <asavkov@...hat.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

On Wed, Sep 27, 2017 at 02:31:03PM +0200, Florian Westphal wrote:
> 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>

Applied to the ipsec tree, thanks everyone!