This is a note to let you know that I've just added the patch titled
iwlwifi: mvm: don't allow A band if SKU forbids it
to the 3.12-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:
iwlwifi-mvm-don-t-allow-a-band-if-sku-forbids-it.patch
and it can be found in the queue-3.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From c512865446e6dd5b6e91e81187e75b734ad7cfc7 Mon Sep 17 00:00:00 2001
From: Emmanuel Grumbach <emmanuel.grumbach@xxxxxxxxx>
Date: Thu, 5 Dec 2013 22:42:55 +0200
Subject: iwlwifi: mvm: don't allow A band if SKU forbids it
From: Emmanuel Grumbach <emmanuel.grumbach@xxxxxxxxx>
commit c512865446e6dd5b6e91e81187e75b734ad7cfc7 upstream.
The driver wasn't reading the NVM properly. While this
didn't lead to any issue until now, it seems that there
is an old version of the NVM in the wild.
In this version, the A band channels appear to be valid
but the SKU capabilities (another field of the NVM) says
that A band isn't supported at all.
With this specific version of the NVM, the driver would
think that A band is supported while the HW / firmware
don't. This leads to asserts.
Reviewed-by: Johannes Berg <johannes.berg@xxxxxxxxx>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/wireless/iwlwifi/iwl-nvm-parse.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/drivers/net/wireless/iwlwifi/iwl-nvm-parse.c
+++ b/drivers/net/wireless/iwlwifi/iwl-nvm-parse.c
@@ -182,6 +182,11 @@ static int iwl_init_channel_map(struct d
for (ch_idx = 0; ch_idx < IWL_NUM_CHANNELS; ch_idx++) {
ch_flags = __le16_to_cpup(nvm_ch_flags + ch_idx);
+
+ if (ch_idx >= NUM_2GHZ_CHANNELS &&
+ !data->sku_cap_band_52GHz_enable)
+ ch_flags &= ~NVM_CHANNEL_VALID;
+
if (!(ch_flags & NVM_CHANNEL_VALID)) {
IWL_DEBUG_EEPROM(dev,
"Ch. %d Flags %x [%sGHz] - No traffic\n",
Patches currently in stable-queue which might be from emmanuel.grumbach@xxxxxxxxx are
queue-3.12/iwlwifi-mvm-bt-coex-disable-bt-when-txing-probe-request-in-scan.patch
queue-3.12/mac80211-release-the-channel-in-error-path-in-start_ap.patch
queue-3.12/iwlwifi-mvm-don-t-allow-a-band-if-sku-forbids-it.patch
queue-3.12/iwlwifi-mvm-print-the-version-of-the-firmware-when-it-asserts.patch
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