This is a note to let you know that I've just added the patch titled
ath5k: fix spontaneus AR5312 freezes
to the 3.10-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:
ath5k-fix-spontaneus-ar5312-freezes.patch
and it can be found in the queue-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 8bfae4f9938b6c1f033a5159febe97e441d6d526 Mon Sep 17 00:00:00 2001
From: Sergey Ryazanov <ryazanov.s.a@xxxxxxxxx>
Date: Wed, 4 Feb 2015 00:21:13 +0300
Subject: ath5k: fix spontaneus AR5312 freezes
From: Sergey Ryazanov <ryazanov.s.a@xxxxxxxxx>
commit 8bfae4f9938b6c1f033a5159febe97e441d6d526 upstream.
Sometimes while CPU have some load and ath5k doing the wireless
interface reset the whole WiSoC completely freezes. Set of tests shows
that using atomic delay function while we wait interface reset helps to
avoid such freezes.
The easiest way to reproduce this issue: create a station interface,
start continous scan with wpa_supplicant and load CPU by something. Or
just create multiple station interfaces and put them all in continous
scan.
This patch partially reverts the commit 1846ac3dbec0 ("ath5k: Use
usleep_range where possible"), which replaces initial udelay()
by usleep_range().
I do not know actual source of this issue, but all looks like that HW
freeze is caused by transaction on internal SoC bus, while wireless
block is in reset state.
Also I should note that I do not know how many chips are affected, but I
did not see this issue with chips, other than AR5312.
CC: Jiri Slaby <jirislaby@xxxxxxxxx>
CC: Nick Kossifidis <mickflemm@xxxxxxxxx>
CC: Luis R. Rodriguez <mcgrof@xxxxxxxxxxxxxxxx>
Fixes: 1846ac3dbec0 ("ath5k: Use usleep_range where possible")
Reported-by: Christophe Prevotaux <c.prevotaux@xxxxxxxxxxxxxxxxxx>
Tested-by: Christophe Prevotaux <c.prevotaux@xxxxxxxxxxxxxxxxxx>
Tested-by: Eric Bree <ebree@xxxxxxxxxx>
Signed-off-by: Sergey Ryazanov <ryazanov.s.a@xxxxxxxxx>
Signed-off-by: Kalle Valo <kvalo@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/wireless/ath/ath5k/reset.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/net/wireless/ath/ath5k/reset.c
+++ b/drivers/net/wireless/ath/ath5k/reset.c
@@ -478,7 +478,7 @@ ath5k_hw_wisoc_reset(struct ath5k_hw *ah
regval = ioread32(reg);
iowrite32(regval | val, reg);
regval = ioread32(reg);
- usleep_range(100, 150);
+ udelay(100); /* NB: should be atomic */
/* Bring BB/MAC out of reset */
iowrite32(regval & ~val, reg);
Patches currently in stable-queue which might be from ryazanov.s.a@xxxxxxxxx are
queue-3.10/ath5k-fix-spontaneus-ar5312-freezes.patch
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