This is a note to let you know that I've just added the patch titled
ath9k_hw: improve reset reliability after errors
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ath9k_hw-improve-reset-reliability-after-errors.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 3412f2f086ea7531378fabe756bd4a1109994ae6 Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@xxxxxxxxxxx>
Date: Mon, 25 Feb 2013 20:51:07 +0100
Subject: ath9k_hw: improve reset reliability after errors
From: Felix Fietkau <nbd@xxxxxxxxxxx>
commit 3412f2f086ea7531378fabe756bd4a1109994ae6 upstream.
On many different chips, important aspects of the MAC state are not
fully cleared by a warm reset. This can show up as tx/rx hangs, those
annoying "DMA failed to stop in 10 ms..." messages or other quirks.
On AR933x, the chip can occasionally get stuck in a way that only a
driver unload/reload or a reboot would bring it back to life.
With this patch, a full reset is issued when bringing the chip out of
FULL-SLEEP state (after idle), or if either Rx or Tx was not shut down
properly. This makes the DMA related error messages disappear completely
in my tests on AR933x, and the chip does not get stuck anymore.
Signed-off-by: Felix Fietkau <nbd@xxxxxxxxxxx>
Signed-off-by: John W. Linville <linville@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/wireless/ath/ath9k/hw.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -1404,7 +1404,9 @@ static bool ath9k_hw_chip_reset(struct a
reset_type = ATH9K_RESET_POWER_ON;
else
reset_type = ATH9K_RESET_COLD;
- }
+ } else if (ah->chip_fullsleep || REG_READ(ah, AR_Q_TXE) ||
+ (REG_READ(ah, AR_CR) & AR_CR_RXE))
+ reset_type = ATH9K_RESET_COLD;
if (!ath9k_hw_set_reset_reg(ah, reset_type))
return false;
Patches currently in stable-queue which might be from nbd@xxxxxxxxxxx are
queue-3.4/ath9k-fix-rssi-dummy-marker-value.patch
queue-3.4/ath9k_hw-improve-reset-reliability-after-errors.patch
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