linux-kernel - Re: [PATCH] fix unaligned exception in /drivers/net/wireless/orinoco.c

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Date:	Mon, 05 Feb 2007 00:08:38 -0500
From:	Pavel Roskin <proski@....org>
To:	"John W. Linville" <linville@...driver.com>
Cc:	"Hennerich, Michael" <Michael.Hennerich@...log.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fix unaligned exception in
	/drivers/net/wireless/orinoco.c

On Fri, 2007-02-02 at 15:20 -0500, John W. Linville wrote:
> On Thu, Jan 18, 2007 at 09:57:18AM -0000, Hennerich, Michael wrote:
> > 
> > This short patch prevents an unaligned exception to occur. (GCC 4.1)
> > tmp is defined as char pointer while it is later accessed as short.

Signed-off-by: Pavel Roskin <proski@....org>

> This patch seems fine, such as it is.  But, it seems like it might
> also be appropriate to change hermes_read_ltv and/or hermes_read_words
> to not take void * parameters?  This patch would still be needed,
> but it might be more obvious to future coders?

I agree.  If we use any optimization that requires alignment of the
buffer for aligned access, it needs to be clearly specified and
(ideally) enforced.

I've tried to make a patch, but it seems to be a bigger effort than I
expected.  It turns out that hermes_clear_words() is not doing what it
should (although it would only affect some buggy firmwares), and it's
clear that I just cannot replace a couple of arguments and hope for the
best.  I need to dust off my 802.11b cards and re-test everything.

I've started orinoco branch locally, and I hope I'll be able to clean
the driver from all that bitrot soon.

-- 
Regards,
Pavel Roskin

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