MSI: Combine pci_(save|restore)_msi/msix_state

The PCI save/restore code doesn't need to care about MSI vs MSI-X, all
it really wants is to say "save/restore all MSI(-X) info for this device".

This is borne out in the code, we call the MSI and MSI-X save routines
side by side, and similarly with the restore routines.

So combine the MSI/MSI-X routines into pci_save_msi_state() and
pci_restore_msi_state(). It is up to those routines to decide what state
needs to be saved.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

3 files changed, 26 insertions, 11 deletions

diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 6cfa6be9a6d5..067ae9917fd6 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -295,7 +295,7 @@ static int msi_lookup_irq(struct pci_dev *dev, int type)
 }
 
 #ifdef CONFIG_PM
-int pci_save_msi_state(struct pci_dev *dev)
+static int __pci_save_msi_state(struct pci_dev *dev)
 {
         int pos, i = 0;
         u16 control;
@@ -333,7 +333,7 @@ int pci_save_msi_state(struct pci_dev *dev)
         return 0;
 }
 
-void pci_restore_msi_state(struct pci_dev *dev)
+static void __pci_restore_msi_state(struct pci_dev *dev)
 {
         int i = 0, pos;
         u16 control;
@@ -361,7 +361,7 @@ void pci_restore_msi_state(struct pci_dev *dev)
         kfree(save_state);
 }
 
-int pci_save_msix_state(struct pci_dev *dev)
+static int __pci_save_msix_state(struct pci_dev *dev)
 {
         int pos;
         int temp;
@@ -409,7 +409,20 @@ int pci_save_msix_state(struct pci_dev *dev)
         return 0;
 }
 
-void pci_restore_msix_state(struct pci_dev *dev)
+int pci_save_msi_state(struct pci_dev *dev)
+{
+        int rc;
+
+        rc = __pci_save_msi_state(dev);
+        if (rc)
+                return rc;
+
+        rc = __pci_save_msix_state(dev);
+
+        return rc;
+}
+
+static void __pci_restore_msix_state(struct pci_dev *dev)
 {
         u16 save;
         int pos;
@@ -446,6 +459,12 @@ void pci_restore_msix_state(struct pci_dev *dev)
         pci_write_config_word(dev, msi_control_reg(pos), save);
         enable_msi_mode(dev, pos, PCI_CAP_ID_MSIX);
 }
+
+void pci_restore_msi_state(struct pci_dev *dev)
+{
+        __pci_restore_msi_state(dev);
+        __pci_restore_msix_state(dev);
+}
 #endif  /* CONFIG_PM */
 
 /**
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 7ae709024456..84c757ba0664 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -634,8 +634,6 @@ pci_save_state(struct pci_dev *dev)
                 pci_read_config_dword(dev, i * 4,&dev->saved_config_space[i]);
         if ((i = pci_save_msi_state(dev)) != 0)
                 return i;
-        if ((i = pci_save_msix_state(dev)) != 0)
-                return i;
         if ((i = pci_save_pcie_state(dev)) != 0)
                 return i;
         if ((i = pci_save_pcix_state(dev)) != 0)
@@ -673,7 +671,7 @@ pci_restore_state(struct pci_dev *dev)
         }
         pci_restore_pcix_state(dev);
         pci_restore_msi_state(dev);
-        pci_restore_msix_state(dev);
+
         return 0;
 }
 
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 4948db0f8100..a4f2d580625e 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -52,17 +52,15 @@ void pci_no_msi(void);
 static inline void disable_msi_mode(struct pci_dev *dev, int pos, int type) { }
 static inline void pci_no_msi(void) { }
 #endif
+
 #if defined(CONFIG_PCI_MSI) && defined(CONFIG_PM)
 int pci_save_msi_state(struct pci_dev *dev);
-int pci_save_msix_state(struct pci_dev *dev);
 void pci_restore_msi_state(struct pci_dev *dev);
-void pci_restore_msix_state(struct pci_dev *dev);
 #else
 static inline int pci_save_msi_state(struct pci_dev *dev) { return 0; }
-static inline int pci_save_msix_state(struct pci_dev *dev) { return 0; }
 static inline void pci_restore_msi_state(struct pci_dev *dev) {}
-static inline void pci_restore_msix_state(struct pci_dev *dev) {}
 #endif
+
 static inline int pci_no_d1d2(struct pci_dev *dev)
 {
         unsigned int parent_dstates = 0;