linux-kernel - Re: [PATCH v2 2/3] pppoatm: fix race condition with destroying of vcc

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Message-ID: <20121101102628.6e3d3cae@thirdoffive.cmf.nrl.navy.mil>
Date:	Thu, 1 Nov 2012 10:26:28 -0400
From:	chas williams - CONTRACTOR <chas@....nrl.navy.mil>
To:	Krzysztof Mazur <krzysiek@...lesie.net>
Cc:	davem@...emloft.net, dwmw2@...radead.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/3] pppoatm: fix race condition with destroying of
 vcc

On Wed, 31 Oct 2012 23:04:35 +0100
Krzysztof Mazur <krzysiek@...lesie.net> wrote:

> There are also some minor potential issues in pppoatm driver:
> 
> 	- locking issues, but now only between pppoatm_send() and
> 	  vcc_sendmsg() and maybe some other functions,

these have been around for a while.  i agree that something should be
done about it.  just not sure what should be synchronizing this mess.

> 	- missing check for SS_CONNECTED in pppoatm_ioctl,

in practice you will never run into this because a pvc is immediately
put into SS_CONNECTED mode (right before the userspace open()
returns).  however, should it check?  yes.  i dont see anything
preventing you from running ppp on svc's.

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