linux-kernel - Re: [ath5k-devel] [PATCH 1/1] ath5k: fix hw rate index condition

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Message-ID: <b6c5339f0903010636o15afa42en4e1b1eb81c2c06e2@mail.gmail.com>
Date:	Sun, 1 Mar 2009 09:36:59 -0500
From:	Bob Copeland <me@...copeland.com>
To:	Pavel Roskin <proski@....org>
Cc:	ath5k-devel@...ema.h4ckr.net, linux-wireless@...r.kernel.org,
	Jiri Slaby <jirislaby@...il.com>,
	"John W. Linville" <linville@...driver.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [ath5k-devel] [PATCH 1/1] ath5k: fix hw rate index condition

On Sun, Mar 1, 2009 at 12:07 AM, Pavel Roskin <proski@....org> wrote:
> On Thu, 2009-02-26 at 21:27 -0500, Bob Copeland wrote:
>
>> Actually, I remembered in the dark recesses of my moldering brain
>> that someone had a lost patch for this a while ago, so I searched
>> the archives.  Pavel, ok to add your s-o-b?
>
> Since my patch was dropped and the new patch was implemented without my
> participation, it makes no sense to put my s-o-b on the code I didn't
> write (even though I wrote something similar before).

Ok, I just wanted to be sure to maintain proper credit, the "From" should
suffice.  I did rewrite the patch but it actually had an identical diff.
FWIW, the thread didn't give a clue why it didn't make it upstream, just
missed I guess (http://marc.info/?l=linux-wireless&m=122480002519627&w=2,
ultimately that problem was fixed by correctly setting the rs_more flag).

Anyway, the patch, while IMO correct, will still result in mac80211
warning in ieee80211_rx with -1 just as 255 will; it just fixes the
subsequent out of bound read.  If we want to tell mac80211 a real rate,
I think we should change it to s8 then hw_to_driver_rix should do
something like:

idx = array[x][y];
if (WARN_ON(idx < 0))
   idx = 0;

return idx;

Then we get the warning in the driver and we also return a real rate up
the stack.  I'll prep a patch for this unless there are any objections.

-- 
Bob Copeland %% www.bobcopeland.com
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