PCI/AER: Factor out interrupt toggling into helpers

There are many places that enable and disable AER interrupt, so move
them into helpers.

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Kai-Heng Feng <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Reviewed-by: Mika Westerberg <[email protected]>
Reviewed-by: Kuppuswamy Sathyanarayanan <[email protected]>
Reviewed-by: Jonathan Cameron <[email protected]>

Author: khfeng

drivers/pci/pcie/aer.c

@@ -1213,6 +1213,28 @@ static irqreturn_t aer_irq(int irq, void *context)
 	return IRQ_WAKE_THREAD;
 }
 
+static void aer_enable_irq(struct pci_dev *pdev)
+{
+	int aer = pdev->aer_cap;
+	u32 reg32;
+
+	/* Enable Root Port's interrupt in response to error messages */
+	pci_read_config_dword(pdev, aer + PCI_ERR_ROOT_COMMAND, &reg32);
+	reg32 |= ROOT_PORT_INTR_ON_MESG_MASK;
+	pci_write_config_dword(pdev, aer + PCI_ERR_ROOT_COMMAND, reg32);
+}
+
+static void aer_disable_irq(struct pci_dev *pdev)
+{
+	int aer = pdev->aer_cap;
+	u32 reg32;
+
+	/* Disable Root's interrupt in response to error messages */
+	pci_read_config_dword(pdev, aer + PCI_ERR_ROOT_COMMAND, &reg32);
+	reg32 &= ~ROOT_PORT_INTR_ON_MESG_MASK;
+	pci_write_config_dword(pdev, aer + PCI_ERR_ROOT_COMMAND, reg32);
+}
+
 /**
  * aer_enable_rootport - enable Root Port's interrupts when receiving messages
  * @rpc: pointer to a Root Port data structure
@@ -1242,10 +1264,7 @@ static void aer_enable_rootport(struct aer_rpc *rpc)
 	pci_read_config_dword(pdev, aer + PCI_ERR_UNCOR_STATUS, &reg32);
 	pci_write_config_dword(pdev, aer + PCI_ERR_UNCOR_STATUS, reg32);
 
-	/* Enable Root Port's interrupt in response to error messages */
-	pci_read_config_dword(pdev, aer + PCI_ERR_ROOT_COMMAND, &reg32);
-	reg32 |= ROOT_PORT_INTR_ON_MESG_MASK;
-	pci_write_config_dword(pdev, aer + PCI_ERR_ROOT_COMMAND, reg32);
+	aer_enable_irq(pdev);
 }
 
 /**
@@ -1260,10 +1279,7 @@ static void aer_disable_rootport(struct aer_rpc *rpc)
 	int aer = pdev->aer_cap;
 	u32 reg32;
 
-	/* Disable Root's interrupt in response to error messages */
-	pci_read_config_dword(pdev, aer + PCI_ERR_ROOT_COMMAND, &reg32);
-	reg32 &= ~ROOT_PORT_INTR_ON_MESG_MASK;
-	pci_write_config_dword(pdev, aer + PCI_ERR_ROOT_COMMAND, reg32);
+	aer_disable_irq(pdev);
 
 	/* Clear Root's error status reg */
 	pci_read_config_dword(pdev, aer + PCI_ERR_ROOT_STATUS, &reg32);
@@ -1358,12 +1374,8 @@ static pci_ers_result_t aer_root_reset(struct pci_dev *dev)
 	 */
 	aer = root ? root->aer_cap : 0;
 
-	if ((host->native_aer || pcie_ports_native) && aer) {
-		/* Disable Root's interrupt in response to error messages */
-		pci_read_config_dword(root, aer + PCI_ERR_ROOT_COMMAND, &reg32);
-		reg32 &= ~ROOT_PORT_INTR_ON_MESG_MASK;
-		pci_write_config_dword(root, aer + PCI_ERR_ROOT_COMMAND, reg32);
-	}
+	if ((host->native_aer || pcie_ports_native) && aer)
+		aer_disable_irq(root);
 
 	if (type == PCI_EXP_TYPE_RC_EC || type == PCI_EXP_TYPE_RC_END) {
 		rc = pcie_reset_flr(dev, PCI_RESET_DO_RESET);
@@ -1382,10 +1394,7 @@ static pci_ers_result_t aer_root_reset(struct pci_dev *dev)
 		pci_read_config_dword(root, aer + PCI_ERR_ROOT_STATUS, &reg32);
 		pci_write_config_dword(root, aer + PCI_ERR_ROOT_STATUS, reg32);
 
-		/* Enable Root Port's interrupt in response to error messages */
-		pci_read_config_dword(root, aer + PCI_ERR_ROOT_COMMAND, &reg32);
-		reg32 |= ROOT_PORT_INTR_ON_MESG_MASK;
-		pci_write_config_dword(root, aer + PCI_ERR_ROOT_COMMAND, reg32);
+		aer_enable_irq(root);
 	}
 
 	return rc ? PCI_ERS_RESULT_DISCONNECT : PCI_ERS_RESULT_RECOVERED;