netdev - Re: [PATCH 4/4] PPPOE: Fix device tear-down notification.

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Date:	Fri, 20 Apr 2007 16:59:55 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	mostrows@...thlink.net
Cc:	mostrows@...son.ibm.com, netdev@...r.kernel.org
Subject: Re: [PATCH 4/4] PPPOE: Fix device tear-down notification.

From: Michal Ostrowski <mostrows@...thlink.net>
Date: Tue, 13 Mar 2007 09:09:35 -0500

> pppoe_flush_dev() kicks all sockets bound to a device that is going down.
> In doing so, locks must be taken in the right order consistently (sock lock,
> followed by the pppoe_hash_lock).  However, the scan process is based on
> us holding the sock lock.  So, when something is found in the scan we must
> release the lock we're holding and grab the sock lock.
> 
> This patch fixes race conditions between this code and pppoe_release(),
> both of which perform similar functions but would naturally prefer to grab
> locks in opposing orders.  Both code paths are now going after these locks
> in a consistent manner.
> 
> pppoe_hash_lock protects the contents of the "pppox_sock" objects that reside
> inside the hash.  Thus, NULL'ing out the pppoe_dev field should be done
> under the protection of this lock.
> 
> Signed-off-by: Michal Ostrowski <mostrows@...thlink.net>

Aha, this one applies cleanly :-)

But I had to edit out some trailing whitespace this patch
added, please be mindful of this in the future, thanks!

Adds trailing whitespace.
diff:48:			
Adds trailing whitespace.
diff:52:			 * hold the sock lock while doing any unbinding, 
Adds trailing whitespace.
diff:53:			 * we need to release the lock we're holding.  
Adds trailing whitespace.
diff:81:		
Adds trailing whitespace.
diff:121:		__delete_item(po->pppoe_pa.sid, 
warning: 5 lines add trailing whitespaces.
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