From e04135c07755d001b5cde61048c69a7cc84bb94b Mon Sep 17 00:00:00 2001
From: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Date: Thu, 10 Feb 2022 18:22:33 +0200
Subject: [PATCH] iwlwifi: mvm: move only to an enabled channel
Git-commit: e04135c07755d001b5cde61048c69a7cc84bb94b
Patch-mainline: v5.18-rc1
References: git-fixes

During disassociation we're decreasing the phy's ref count.
If the ref count becomes 0, we're configuring the phy ctxt
to the default channel (the lowest channel which the device
can operate on). Currently we're not checking whether the
the default channel is enabled or not. Fix it by configuring
the phy ctxt to the lowest channel which is enabled.

Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20220210181930.03f281b6a6bc.I5b63d43ec41996d599e6f37ec3f32e878b3e405e@changeid
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 .../net/wireless/intel/iwlwifi/mvm/phy-ctxt.c | 31 +++++++++++++------
 1 file changed, 22 insertions(+), 9 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/phy-ctxt.c b/drivers/net/wireless/intel/iwlwifi/mvm/phy-ctxt.c
index 24d86ca15850..a3cefbc43e80 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/phy-ctxt.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/phy-ctxt.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
 /*
- * Copyright (C) 2012-2014, 2018-2021 Intel Corporation
+ * Copyright (C) 2012-2014, 2018-2022 Intel Corporation
  * Copyright (C) 2013-2014 Intel Mobile Communications GmbH
  * Copyright (C) 2017 Intel Deutschland GmbH
  */
@@ -345,18 +345,31 @@ void iwl_mvm_phy_ctxt_unref(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt)
 	 * otherwise we might not be able to reuse this phy.
 	 */
 	if (ctxt->ref == 0) {
-		struct ieee80211_channel *chan;
+		struct ieee80211_channel *chan = NULL;
 		struct cfg80211_chan_def chandef;
-		struct ieee80211_supported_band *sband = NULL;
-		enum nl80211_band band = NL80211_BAND_2GHZ;
+		struct ieee80211_supported_band *sband;
+		enum nl80211_band band;
+		int channel;
 
-		while (!sband && band < NUM_NL80211_BANDS)
-			sband = mvm->hw->wiphy->bands[band++];
+		for (band = NL80211_BAND_2GHZ; band < NUM_NL80211_BANDS; band++) {
+			sband = mvm->hw->wiphy->bands[band];
 
-		if (WARN_ON(!sband))
-			return;
+			if (!sband)
+				continue;
+
+			for (channel = 0; channel < sband->n_channels; channel++)
+				if (!(sband->channels[channel].flags &
+						IEEE80211_CHAN_DISABLED)) {
+					chan = &sband->channels[channel];
+					break;
+				}
 
-		chan = &sband->channels[0];
+			if (chan)
+				break;
+		}
+
+		if (WARN_ON(!chan))
+			return;
 
 		cfg80211_chandef_create(&chandef, chan, NL80211_CHAN_NO_HT);
 		iwl_mvm_phy_ctxt_changed(mvm, ctxt, &chandef, 1, 1);
-- 
2.31.1