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

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Message-ID: <AE90C24D6B3A694183C094C60CF0A2F6026B73A9@saturn3.aculab.com>
Date:	Thu, 24 Oct 2013 11:39:02 +0100
From:	"David Laight" <David.Laight@...LAB.COM>
To:	"Veaceslav Falico" <vfalico@...hat.com>,
	"Nikolay Aleksandrov" <nikolay@...hat.com>
Cc:	<netdev@...r.kernel.org>, <davem@...emloft.net>
Subject: RE: [PATCH net] netconsole: fix NULL pointer dereference

> >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. */

	David



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