From dd36a507c806165c0f725413ee2e24c41d8a520d Mon Sep 17 00:00:00 2001
From: Tova Mussai <tova.mussai@intel.com>
Date: Thu, 4 Jul 2019 14:34:54 +0300
Subject: [PATCH] iwlwifi: mvm: look for the first supported channel when add/remove phy ctxt
Git-commit: dd36a507c806165c0f725413ee2e24c41d8a520d
Patch-mainline: v5.4-rc1
References: jsc#SLE-13430

Can't rely that band 2.4 is always supported by the NIC and use the
first channel in this band for the phy ctxt.
Instead, look for the first channel in the first band that is supported

Signed-off-by: Tova Mussai <tova.mussai@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/net/wireless/intel/iwlwifi/mvm/fw.c       | 11 ++++++++++-
 drivers/net/wireless/intel/iwlwifi/mvm/phy-ctxt.c | 11 ++++++++++-
 2 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/fw.c b/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
index d2baea22cba2..a6e360194e00 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
@@ -1282,6 +1282,7 @@ int iwl_mvm_up(struct iwl_mvm *mvm)
 	int ret, i;
 	struct ieee80211_channel *chan;
 	struct cfg80211_chan_def chandef;
+	struct ieee80211_supported_band *sband = NULL;
 
 	lockdep_assert_held(&mvm->mutex);
 
@@ -1371,7 +1372,15 @@ int iwl_mvm_up(struct iwl_mvm *mvm)
 		goto error;
 
 	/* Add all the PHY contexts */
-	chan = &mvm->hw->wiphy->bands[NL80211_BAND_2GHZ]->channels[0];
+	i = 0;
+	while (!sband && i < NUM_NL80211_BANDS)
+		sband = mvm->hw->wiphy->bands[i++];
+
+	if (WARN_ON_ONCE(!sband))
+		goto error;
+
+	chan = &sband->channels[0];
+
 	cfg80211_chandef_create(&chandef, chan, NL80211_CHAN_NO_HT);
 	for (i = 0; i < NUM_PHY_CTX; i++) {
 		/*
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/phy-ctxt.c b/drivers/net/wireless/intel/iwlwifi/mvm/phy-ctxt.c
index 86e40bae57e3..0243dbe8ac49 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/phy-ctxt.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/phy-ctxt.c
@@ -289,8 +289,17 @@ void iwl_mvm_phy_ctxt_unref(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt)
 	if (ctxt->ref == 0) {
 		struct ieee80211_channel *chan;
 		struct cfg80211_chan_def chandef;
+		struct ieee80211_supported_band *sband = NULL;
+		enum nl80211_band band = NL80211_BAND_2GHZ;
+
+		while (!sband && band < NUM_NL80211_BANDS)
+			sband = mvm->hw->wiphy->bands[band++];
+
+		if (WARN_ON(!sband))
+			return;
+
+		chan = &sband->channels[0];
 
-		chan = &mvm->hw->wiphy->bands[NL80211_BAND_2GHZ]->channels[0];
 		cfg80211_chandef_create(&chandef, chan, NL80211_CHAN_NO_HT);
 		iwl_mvm_phy_ctxt_changed(mvm, ctxt, &chandef, 1, 1);
 	}
-- 
2.16.4