FAILED: patch "[PATCH] iwlwifi: mvm: fix regulatory domain update when the firmware" failed to apply to 4.4-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 4.4-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

>From 82715ac71e6b94a2c2136e31f3a8e6748e33aa8c Mon Sep 17 00:00:00 2001
From: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Date: Wed, 3 Oct 2018 11:16:54 +0300
Subject: [PATCH] iwlwifi: mvm: fix regulatory domain update when the firmware
 starts

When the firmware starts, it doesn't have any regulatory
information, hence it uses the world wide limitations. The
driver can feed the firmware with previous knowledge that
was kept in the driver, but the firmware may still not
update its internal tables.

This happens when we start a BSS interface, and then the
firmware can change the regulatory tables based on our
location and it'll use more lenient, location specific
rules. Then, if the firmware is shut down (when the
interface is brought down), and then an AP interface is
created, the firmware will forget the country specific
rules.

The host will think that we are in a certain country that
may allow channels and will try to teach the firmware about
our location, but the firmware may still not allow to drop
the world wide limitations and apply country specific rules
because it was just re-started.

In this case, the firmware will reply with MCC_RESP_ILLEGAL
to the MCC_UPDATE_CMD. In that case, iwlwifi needs to let
the upper layers (cfg80211 / hostapd) know that the channel
list they know about has been updated.

This fixes https://bugzilla.kernel.org/show_bug.cgi?id=201105

Cc: stable@vger.kernel.org
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
index 7c09ce20e8b1..00f831d88366 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
@@ -301,8 +301,12 @@ struct ieee80211_regdomain *iwl_mvm_get_regdomain(struct wiphy *wiphy,
 		goto out;
 	}
 
-	if (changed)
-		*changed = (resp->status == MCC_RESP_NEW_CHAN_PROFILE);
+	if (changed) {
+		u32 status = le32_to_cpu(resp->status);
+
+		*changed = (status == MCC_RESP_NEW_CHAN_PROFILE ||
+			    status == MCC_RESP_ILLEGAL);
+	}
 
 	regd = iwl_parse_nvm_mcc_info(mvm->trans->dev, mvm->cfg,
 				      __le32_to_cpu(resp->n_channels),
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/nvm.c b/drivers/net/wireless/intel/iwlwifi/mvm/nvm.c
index 3633f27d048a..6fc5cc1f2b5b 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/nvm.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/nvm.c
@@ -539,9 +539,8 @@ iwl_mvm_update_mcc(struct iwl_mvm *mvm, const char *alpha2,
 	}
 
 	IWL_DEBUG_LAR(mvm,
-		      "MCC response status: 0x%x. new MCC: 0x%x ('%c%c') change: %d n_chans: %d\n",
-		      status, mcc, mcc >> 8, mcc & 0xff,
-		      !!(status == MCC_RESP_NEW_CHAN_PROFILE), n_channels);
+		      "MCC response status: 0x%x. new MCC: 0x%x ('%c%c') n_chans: %d\n",
+		      status, mcc, mcc >> 8, mcc & 0xff, n_channels);
 
 exit:
 	iwl_free_resp(&cmd);