linux-kernel - Re: ath: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x02000020 DMADBG

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Date:	Fri, 06 Apr 2012 09:40:20 -0700
From:	"Justin P. Mattock" <justinmattock@...il.com>
To:	Sujith Manoharan <c_manoha@....qualcomm.com>
CC:	Mohammed Shafi <shafi.wireless@...il.com>,
	Linux-wireless <linux-wireless@...r.kernel.org>,
	Felix Fietkau <nbd@...nwrt.org>, linux-kernel@...r.kernel.org,
	Linux-netdev <netdev@...r.kernel.org>
Subject: Re: ath: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x02000020
 DMADBG_7=0x00008040

On 03/26/2012 07:17 PM, Sujith Manoharan wrote:
> Justin P. Mattock wrote:
>> I would have to say this patch above does get rid of this crash I was
>> seeing. as a quick test I simply connect to a WPA network, then connect
>> to an open network going back and forth triggers this freeze for me
>> after applying this I am able to toggle back and forth without a freeze.
>
> Thanks for verifying.
>
> Sujith
>


 From going through the warning message I was playing around and am 
looking at: AH_UNPLUGGED .. seems if I remove this from the code I have 
not seen this warning message.
is there something wrong with AH_UNPLUGGED = 0x2 ?
is this the wrong address(0x2)?

the patch that I was using is:

 From ea8a7d6ecf8b0706f3f0521cd22cc359b20b9373 Mon Sep 17 00:00:00 2001
From: "Justin P. Mattock" <justinmattock@...il.com>
Date: Sun, 25 Mar 2012 21:53:31 -0700
Subject: [PATCH] ath_test

Signed-off-by: Justin P. Mattock <justinmattock@...il.com>

---
  drivers/net/wireless/ath/ath9k/recv.c |    3 +--
  1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/ath/ath9k/recv.c 
b/drivers/net/wireless/ath/ath9k/recv.c
index f4ae3ba..d887cee 100644
--- a/drivers/net/wireless/ath/ath9k/recv.c
+++ b/drivers/net/wireless/ath/ath9k/recv.c
@@ -523,8 +523,7 @@ bool ath_stoprecv(struct ath_softc *sc)
  		sc->rx.rxlink = NULL;
  	spin_unlock_bh(&sc->rx.rxbuflock);

-	if (!(ah->ah_flags & AH_UNPLUGGED) &&
-	    unlikely(!stopped)) {
+	if (!(ah->ah_flags) && unlikely(!stopped)) {
  		ath_err(ath9k_hw_common(sc->sc_ah),
  			"Could not stop RX, we could be "
  			"confusing the DMA engine when we start RX up\n");
-- 
1.7.5.4


let me know what you think!

Justin P. Mattock
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