From: Sara Sharon <sara.sha...@intel.com>

[ Upstream commit fe56d05ee6c87f6a1a8c7267affd92c9438249cc ]

During CSA, we briefly nullify the phy context, in 
__iwl_mvm_unassign_vif_chanctx.
In case we have a FW assert right after it, it remains NULL though.
We end up running into endless loop due to mac80211 trying repeatedly to
move us to ASSOC state, and we keep returning -EINVAL. Later down the road
we hit a kernel panic.

Detect and avoid this endless loop.

Signed-off-by: Sara Sharon <sara.sha...@intel.com>
Signed-off-by: Luca Coelho <luciano.coe...@intel.com>
Signed-off-by: Kalle Valo <kv...@codeaurora.org>
Link: 
https://lore.kernel.org/r/iwlwifi.20201107104557.d64de2c17bff.Iedd0d2afa20a2aacba5259a5cae31cb3a119a4eb@changeid
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c 
b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
index 525b26e0f65ee..2fad20c845b47 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
@@ -2880,7 +2880,7 @@ static int iwl_mvm_mac_sta_state(struct ieee80211_hw *hw,
 
        /* this would be a mac80211 bug ... but don't crash */
        if (WARN_ON_ONCE(!mvmvif->phy_ctxt))
-               return -EINVAL;
+               return test_bit(IWL_MVM_STATUS_HW_RESTART_REQUESTED, 
&mvm->status) ? 0 : -EINVAL;
 
        /*
         * If we are in a STA removal flow and in DQA mode:
-- 
2.27.0



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