wifi: iwlwifi: mvm: don't wait for tx queues if firmware is dead

[ Upstream commit 3a84454f5204718ca5b4ad2c1f0bf2031e2403d1 ]

There is a WARNING in iwl_trans_wait_tx_queues_empty() (that was
recently converted from just a message), that can be hit if we
wait for TX queues to become empty after firmware died. Clearly,
we can't expect anything from the firmware after it's declared dead.

Don't call iwl_trans_wait_tx_queues_empty() in this case. While it could
be a good idea to stop the flow earlier, the flush functions do some
maintenance work that is not related to the firmware, so keep that part
of the code running even when the firmware is not running.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://patch.msgid.link/20240825191257.a7cbd794cee9.I44a739fbd4ffcc46b83844dd1c7b2eb0c7b270f6@changeid
[edit commit message]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
index f973efbbc3795e458b449a1ffe9ce9a6f37b88d3..d2daea3b1f38ad3b79574b7f685e5fb2565511ec 100644 (file)
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
@@ -5589,6 +5589,10 @@ static void iwl_mvm_flush_no_vif(struct iwl_mvm *mvm, u32 queues, bool drop)
        int i;
 
        if (!iwl_mvm_has_new_tx_api(mvm)) {
+               /* we can't ask the firmware anything if it is dead */
+               if (test_bit(IWL_MVM_STATUS_HW_RESTART_REQUESTED,
+                            &mvm->status))
+                       return;
                if (drop) {
                        mutex_lock(&mvm->mutex);
                        iwl_mvm_flush_tx_path(mvm,
@@ -5673,8 +5677,11 @@ void iwl_mvm_mac_flush(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 
        /* this can take a while, and we may need/want other operations
         * to succeed while doing this, so do it without the mutex held
+        * If the firmware is dead, this can't work...
         */
-       if (!drop && !iwl_mvm_has_new_tx_api(mvm))
+       if (!drop && !iwl_mvm_has_new_tx_api(mvm) &&
+           !test_bit(IWL_MVM_STATUS_HW_RESTART_REQUESTED,
+                     &mvm->status))
                iwl_trans_wait_tx_queues_empty(mvm->trans, msk);
 }