diff mbox series

[6/6] iwlwifi: mvm: fix kernel panic in case of assert during CSA

Message ID iwlwifi.20201107104557.d64de2c17bff.Iedd0d2afa20a2aacba5259a5cae31cb3a119a4eb@changeid (mailing list archive)
State Accepted
Commit fe56d05ee6c87f6a1a8c7267affd92c9438249cc
Delegated to: Kalle Valo
Headers show
Series iwlwifi: fixes intended for v5.10 2020-11-07 | expand

Commit Message

Luca Coelho Nov. 7, 2020, 8:50 a.m. UTC 
From: Sara Sharon <sara.sharon@intel.com>

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.sharon@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
---
 drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
index 62e884f3e29e..b627e7da7ac9 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
@@ -3080,7 +3080,7 @@  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: