wifi: iwlwifi: keep BHs disabled when TXing from reclaim

During reclaim, we may release the txq->lock spinlock in order to call
iwl_trans_tx to queue new frames. The iwl_trans_tx function expects to
be called with BHs disabled and iwl_pcie_reclaim is most of the times
called with BHs disabled already. However, reclaim can also happen after
flushing a STA and in that case BHs will not be disabled.

Solve this corner case by only releasing the spinlock but keeping BHs
disabled.
Signed-off-by: Benjamin Berg <benjamin.berg@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://patch.msgid.link/20240703125541.5d12e0e54e9f.Ic53a7ff75f1163eb38bdcf5d66b503e91e6ce5ca@changeidSigned-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/intel/iwlwifi/pcie/tx.c

@@ -2412,7 +2412,7 @@ void iwl_pcie_reclaim(struct iwl_trans *trans, int txq_id, int ssn,
 		 * have tx as well. Bottom line, we can unlock and re-lock
 		 * later.
 		 */
-		spin_unlock_bh(&txq->lock);
+		spin_unlock(&txq->lock);
 
 		while ((skb = __skb_dequeue(&overflow_skbs))) {
 			struct iwl_device_tx_cmd *dev_cmd_ptr;
@@ -2431,7 +2431,7 @@ void iwl_pcie_reclaim(struct iwl_trans *trans, int txq_id, int ssn,
 		if (iwl_txq_space(trans, txq) > txq->low_mark)
 			iwl_trans_pcie_wake_queue(trans, txq);
 
-		spin_lock_bh(&txq->lock);
+		spin_lock(&txq->lock);
 		txq->overflow_tx = false;
 	}