iwlwifi: pcie: refactor cmd_in_flight set/clear code

A following patche will use trans_pcie->cmd_in_flight
for reference accounting as well. get ready for it.
Signed-off-by: NEliad Peller <eliadx.peller@intel.com>
Reviewed-by: NJohannes Berg <johannes.berg@intel.com>
Signed-off-by: NEmmanuel Grumbach <emmanuel.grumbach@intel.com>

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

@@ -989,6 +989,65 @@ void iwl_trans_pcie_reclaim(struct iwl_trans *trans, int txq_id, int ssn,
 	spin_unlock_bh(&txq->lock);
 }
 
+static int iwl_pcie_set_cmd_in_flight(struct iwl_trans *trans)
+{
+	struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
+	int ret;
+
+	lockdep_assert_held(&trans_pcie->reg_lock);
+
+	if (trans_pcie->cmd_in_flight)
+		return 0;
+
+	trans_pcie->cmd_in_flight = true;
+
+	/*
+	 * wake up the NIC to make sure that the firmware will see the host
+	 * command - we will let the NIC sleep once all the host commands
+	 * returned. This needs to be done only on NICs that have
+	 * apmg_wake_up_wa set.
+	 */
+	if (trans->cfg->base_params->apmg_wake_up_wa) {
+		__iwl_trans_pcie_set_bit(trans, CSR_GP_CNTRL,
+					 CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
+		if (trans->cfg->device_family == IWL_DEVICE_FAMILY_8000)
+			udelay(2);
+
+		ret = iwl_poll_bit(trans, CSR_GP_CNTRL,
+				   CSR_GP_CNTRL_REG_VAL_MAC_ACCESS_EN,
+				   (CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY |
+				    CSR_GP_CNTRL_REG_FLAG_GOING_TO_SLEEP),
+				   15000);
+		if (ret < 0) {
+			__iwl_trans_pcie_clear_bit(trans, CSR_GP_CNTRL,
+					CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
+			trans_pcie->cmd_in_flight = false;
+			IWL_ERR(trans, "Failed to wake NIC for hcmd\n");
+			return -EIO;
+		}
+	}
+
+	return 0;
+}
+
+static int iwl_pcie_clear_cmd_in_flight(struct iwl_trans *trans)
+{
+	struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
+
+	lockdep_assert_held(&trans_pcie->reg_lock);
+
+	if (WARN_ON(!trans_pcie->cmd_in_flight))
+		return 0;
+
+	trans_pcie->cmd_in_flight = false;
+
+	if (trans->cfg->base_params->apmg_wake_up_wa)
+		__iwl_trans_pcie_clear_bit(trans, CSR_GP_CNTRL,
+					CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
+
+	return 0;
+}
+
 /*
  * iwl_pcie_cmdq_reclaim - Reclaim TX command queue entries already Tx'd
  *
@@ -1024,14 +1083,9 @@ static void iwl_pcie_cmdq_reclaim(struct iwl_trans *trans, int txq_id, int idx)
 		}
 	}
 
-	if (trans->cfg->base_params->apmg_wake_up_wa &&
-	    q->read_ptr == q->write_ptr) {
+	if (q->read_ptr == q->write_ptr) {
 		spin_lock_irqsave(&trans_pcie->reg_lock, flags);
-		WARN_ON(!trans_pcie->cmd_in_flight);
-		trans_pcie->cmd_in_flight = false;
-		__iwl_trans_pcie_clear_bit(trans,
-					   CSR_GP_CNTRL,
-					   CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
+		iwl_pcie_clear_cmd_in_flight(trans);
 		spin_unlock_irqrestore(&trans_pcie->reg_lock, flags);
 	}
 
@@ -1419,35 +1473,11 @@ static int iwl_pcie_enqueue_hcmd(struct iwl_trans *trans,
 		mod_timer(&txq->stuck_timer, jiffies + trans_pcie->wd_timeout);
 
 	spin_lock_irqsave(&trans_pcie->reg_lock, flags);
-
-	/*
-	 * wake up the NIC to make sure that the firmware will see the host
-	 * command - we will let the NIC sleep once all the host commands
-	 * returned. This needs to be done only on NICs that have
-	 * apmg_wake_up_wa set.
-	 */
-	if (trans->cfg->base_params->apmg_wake_up_wa &&
-	    !trans_pcie->cmd_in_flight) {
-		trans_pcie->cmd_in_flight = true;
-		__iwl_trans_pcie_set_bit(trans, CSR_GP_CNTRL,
-					 CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
-		if (trans->cfg->device_family == IWL_DEVICE_FAMILY_8000)
-			udelay(2);
-
-		ret = iwl_poll_bit(trans, CSR_GP_CNTRL,
-				   CSR_GP_CNTRL_REG_VAL_MAC_ACCESS_EN,
-				   (CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY |
-				    CSR_GP_CNTRL_REG_FLAG_GOING_TO_SLEEP),
-				   15000);
-		if (ret < 0) {
-			__iwl_trans_pcie_clear_bit(trans, CSR_GP_CNTRL,
-				   CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
-			spin_unlock_irqrestore(&trans_pcie->reg_lock, flags);
-			trans_pcie->cmd_in_flight = false;
-			IWL_ERR(trans, "Failed to wake NIC for hcmd\n");
-			idx = -EIO;
-			goto out;
-		}
+	ret = iwl_pcie_set_cmd_in_flight(trans);
+	if (ret < 0) {
+		idx = ret;
+		spin_unlock_irqrestore(&trans_pcie->reg_lock, flags);
+		goto out;
 	}
 
 	/* Increment and update queue's write index */