netdev - Re: [PATCH RFC 1/2] flow: virtualize get and entry deletion methods

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Date:	Mon, 29 Mar 2010 15:33:57 +0300
From:	Timo Teräs <timo.teras@....fi>
To:	Herbert Xu <herbert@...dor.apana.org.au>
CC:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH RFC 1/2] flow: virtualize get and entry deletion methods

Herbert Xu wrote:
> On Mon, Mar 29, 2010 at 03:20:13PM +0300, Timo Teräs wrote:
>> But as noted few mails ago, it's not necessary. So I'll just go
>> ahead and remove all locking from the read side, and move the
>> xfrm_policy_kill to use plain write.
> 
> No you can't make it a plain write in xfrm_policy_kill.  The same
> policy may be killed simultaneously, by the timer and user action.

So we fix up all the callers of xfrm_policy_kill to check properly
result of __xfrm_policy_unlink(). Since the policy can be only
once deleted from the hashes (it's protected by xfrm_policy_lock)
return value of __xfrm_policy_unlink() can be used to give
responsibility of calling xfrm_policy_kill() exactly once.

I thought this was already being done, but apparently it's not
the case.
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