[PATCH] PCI: remove msi save/restore code in specific driver

Remove pcie port driver's msi save/restore code.
Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/pci/pcie/portdrv.h

@@ -29,7 +29,6 @@
 
 struct pcie_port_device_ext {
 	int interrupt_mode;	/* [0:INTx | 1:MSI | 2:MSI-X] */
-	unsigned int saved_msi_config_space[5];
 };
 
 extern struct bus_type pcie_port_bus_type;

drivers/pci/pcie/portdrv_pci.c

@@ -30,75 +30,16 @@ MODULE_LICENSE("GPL");
 /* global data */
 static const char device_name[] = "pcieport-driver";
 
-static void pci_save_msi_state(struct pci_dev *dev)
+static int pcie_portdrv_save_config(struct pci_dev *dev)
 {
-	struct pcie_port_device_ext *p_ext = pci_get_drvdata(dev);
-	int i = 0, pos;
-	u16 control;
-
-   	if ((pos = pci_find_capability(dev, PCI_CAP_ID_MSI)) <= 0)
-		return;
-
-	pci_read_config_dword(dev, pos, &p_ext->saved_msi_config_space[i++]);
-	control = p_ext->saved_msi_config_space[0] >> 16;
-	pci_read_config_dword(dev, pos + PCI_MSI_ADDRESS_LO,
-		&p_ext->saved_msi_config_space[i++]);
-	if (control & PCI_MSI_FLAGS_64BIT) {
-		pci_read_config_dword(dev, pos + PCI_MSI_ADDRESS_HI,
-			&p_ext->saved_msi_config_space[i++]);
-		pci_read_config_dword(dev, pos + PCI_MSI_DATA_64,
-			&p_ext->saved_msi_config_space[i++]);
-	} else
-		pci_read_config_dword(dev, pos + PCI_MSI_DATA_32,
-			&p_ext->saved_msi_config_space[i++]);
-	if (control & PCI_MSI_FLAGS_MASKBIT)
-		pci_read_config_dword(dev, pos + PCI_MSI_MASK_BIT,
-			&p_ext->saved_msi_config_space[i++]);
-}
-
-static void pci_restore_msi_state(struct pci_dev *dev)
-{
-	struct pcie_port_device_ext *p_ext = pci_get_drvdata(dev);
-	int i = 0, pos;
-	u16 control;
-
-   	if ((pos = pci_find_capability(dev, PCI_CAP_ID_MSI)) <= 0)
-		return;
-
-	control = p_ext->saved_msi_config_space[i++] >> 16;
-	pci_write_config_word(dev, pos + PCI_MSI_FLAGS, control);
-	pci_write_config_dword(dev, pos + PCI_MSI_ADDRESS_LO,
-		p_ext->saved_msi_config_space[i++]);
-	if (control & PCI_MSI_FLAGS_64BIT) {
-		pci_write_config_dword(dev, pos + PCI_MSI_ADDRESS_HI,
-			p_ext->saved_msi_config_space[i++]);
-		pci_write_config_dword(dev, pos + PCI_MSI_DATA_64,
-			p_ext->saved_msi_config_space[i++]);
-	} else
-		pci_write_config_dword(dev, pos + PCI_MSI_DATA_32,
-			p_ext->saved_msi_config_space[i++]);
-	if (control & PCI_MSI_FLAGS_MASKBIT)
-		pci_write_config_dword(dev, pos + PCI_MSI_MASK_BIT,
-			p_ext->saved_msi_config_space[i++]);
-}
-
-static void pcie_portdrv_save_config(struct pci_dev *dev)
-{
-	struct pcie_port_device_ext *p_ext = pci_get_drvdata(dev);
-
-	pci_save_state(dev);
-	if (p_ext->interrupt_mode == PCIE_PORT_MSI_MODE)
-		pci_save_msi_state(dev);
+	return pci_save_state(dev);
 }
 
 static int pcie_portdrv_restore_config(struct pci_dev *dev)
 {
-	struct pcie_port_device_ext *p_ext = pci_get_drvdata(dev);
 	int retval;
 
 	pci_restore_state(dev);
-	if (p_ext->interrupt_mode == PCIE_PORT_MSI_MODE)
-		pci_restore_msi_state(dev);
 	retval = pci_enable_device(dev);
 	if (retval)
 		return retval;
@@ -149,7 +90,8 @@ static int pcie_portdrv_suspend (struct pci_dev *dev, pm_message_t state)
 {
 	int ret = pcie_port_device_suspend(dev, state);
 
-	pcie_portdrv_save_config(dev);
+	if (!ret)
+		ret = pcie_portdrv_save_config(dev);
 	return ret;
 }