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

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Date:	Wed,  7 Jan 2009 15:36:05 +0100
From:	Jiri Slaby <jirislaby@...il.com>
To:	Dhaval Giani <dhaval@...ux.vnet.ibm.com>
Cc:	linville@...driver.com, davem@...emloft.net,
	linux-wireless@...r.kernel.org, ath5k-devel@...ema.h4ckr.net,
	Nick Kossifidis <mickflemm@...il.com>,
	"Luis R. Rodriguez" <lrodriguez@...eros.com>,
	Bob Copeland <me@...copeland.com>,
	linux-kernel@...r.kernel.org, Jiri Slaby <jirislaby@...il.com>
Subject: Re: [PATCH 1/1] ath5k: fix hw rate index condition

On 01/07/2009 02:51 PM, Jiri Slaby wrote:
> Dhaval Giani wrote:
>> I see this on current git. Not sure how to reproduce it, has happened on
>> two random occasions. At both times, I was not connected to a wireless
>> network, but to wired networks.
>>
>> ------------[ cut here ]------------
>> WARNING: at net/mac80211/rx.c:2234 __ieee80211_rx+0x7f/0x559
>> ...
>> Call Trace:
>>  [<f80d4192>] __ieee80211_rx+0x7f/0x559 [mac80211]
>>  [<f80a19f4>] ath5k_tasklet_rx+0x4f7/0x53b [ath5k]
>> ...
> 
> Hmm, maybe ath5k is culprit. Could you apply the attached patch and
> use the kernel till the problem appears again?

I don't think this will print anything, the rate won't be 32, it's rather
too high. Could you apply also the appended debug one?

---
 net/mac80211/rx.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 7175ae8..5e17e57 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -2230,8 +2230,10 @@ void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
 		 * MCS aware. */
 		rate = &sband->bitrates[sband->n_bitrates - 1];
 	} else {
-		if (WARN_ON(status->rate_idx < 0 ||
-			    status->rate_idx >= sband->n_bitrates))
+		if (WARN(status->rate_idx < 0 ||
+			    status->rate_idx >= sband->n_bitrates,
+			    "RATE=%u, BAND=%x\n", status->rate_idx,
+			    sband->n_bitrates))
 			return;
 		rate = &sband->bitrates[status->rate_idx];
 	}
-- 
1.6.0.6

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