netdev - Re: [PATCH net] netconsole: fix NULL pointer dereference

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Message-Id: <20131024.135614.1725589105857635534.davem@davemloft.net>
Date:	Thu, 24 Oct 2013 13:56:14 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	David.Laight@...LAB.COM
Cc:	vfalico@...hat.com, nikolay@...hat.com, netdev@...r.kernel.org
Subject: Re: [PATCH net] netconsole: fix NULL pointer dereference

From: "David Laight" <David.Laight@...LAB.COM>
Date: Thu, 24 Oct 2013 11:39:02 +0100

>> >Taking the spinlock seems like the cleanest way to insure there's noone
>> >running in parallel, but I'm open to suggestions as I'm not satisfied with
>> >the looks of this. I'll prepare a net-next patchset for netconsole soon to
>> >clean it up properly, all of these can be easily simplified.
>> 
>> First when I've seen 'spin_lock(); a = 1; spin_unlock()' I've thought
>> "WTF?", however indeed it will stop us racing with write_msg().
> 
> Ditto - might be worth saying:
>     /* Acquire lock to wait for any write_msg() to complete. */

Something this subtle definitely requires a comment.
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