netdev - Re: [PATCH 5/6] alx: fix MAC address alignment problem

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Message-ID: <1371804212.10400.1.camel@jlt4.sipsolutions.net>
Date:	Fri, 21 Jun 2013 10:43:32 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	David Laight <David.Laight@...LAB.COM>
Cc:	netdev@...r.kernel.org, ben@...adent.org.uk
Subject: Re: [PATCH 5/6] alx: fix MAC address alignment problem

On Fri, 2013-06-21 at 09:38 +0100, David Laight wrote:
> > In two places, parts of MAC addresses are used as u32/u16
> > values. This can cause alignment problems, use put_unaligned
> > and get_unaligned to fix this.
> 
> I suspect they are always 16bit aligned, so 16bit accesses
> would be ok - rather than using byte accesses.
> However I wouldn't know how to request this with the available
> definitions....

For at least one of them, there's no such guarantee.

johannes

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