netdev - Re: [PATCH v3 8/7] pppoatm: fix missing wakeup in pppoatm

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Message-ID: <20121111184947.GA26444@shrek.podlesie.net>
Date:	Sun, 11 Nov 2012 19:49:47 +0100
From:	Krzysztof Mazur <krzysiek@...lesie.net>
To:	David Woodhouse <dwmw2@...radead.org>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Chas Williams - CONTRACTOR <chas@....nrl.navy.mil>,
	davem@...emloft.net
Subject: Re: [PATCH v3 8/7] pppoatm: fix missing wakeup in pppoatm_send()

On Sun, Nov 11, 2012 at 05:03:21PM +0000, David Woodhouse wrote:
> On Sun, 2012-11-11 at 17:12 +0100, Krzysztof Mazur wrote:
> > It would require using atomic ops because also pppoatm_pop() can
> > modify this word. I think it's better to add additional word instead
> > of using atomic ops.
> 
> Or use the existing flags word, perhaps. Only one bit of which is
> actually used already. We'd have to filter the new bit out in
> pppoatm_devppp_ioctl().
> 

In pppoatm_devppp_ioctl() we also don't have sk->sk_lock.slock lock.
In original patch synchronization was trivial because callback
from socket lock is used.

I also though about sharing word with encaps enum - encaps needs only 2 bits,
but it's ugly.

Krzysiek
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