From: David Miller <davem@davemloft.net>
To: David.Laight@ACULAB.COM
Cc: vfalico@redhat.com, nikolay@redhat.com, netdev@vger.kernel.org
Subject: Re: [PATCH net] netconsole: fix NULL pointer dereference
Date: Thu, 24 Oct 2013 13:56:14 -0400 (EDT) [thread overview]
Message-ID: <20131024.135614.1725589105857635534.davem@davemloft.net> (raw)
In-Reply-To: <AE90C24D6B3A694183C094C60CF0A2F6026B73A9@saturn3.aculab.com>
From: "David Laight" <David.Laight@ACULAB.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.
next prev parent reply other threads:[~2013-10-24 17:56 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-23 13:04 [PATCH net] netconsole: fix NULL pointer dereference Nikolay Aleksandrov
2013-10-24 10:21 ` Veaceslav Falico
2013-10-24 10:39 ` David Laight
2013-10-24 17:56 ` David Miller [this message]
2013-10-24 18:22 ` Nikolay Aleksandrov
2013-10-24 20:59 ` Francois Romieu
2013-10-25 14:15 ` Nikolay Aleksandrov
2013-10-25 23:06 ` Francois Romieu
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