Driver Core: Make PM operations a const pointer

They are not supposed to be modified by drivers, so make them const.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>

4 files changed, 19 insertions, 16 deletions

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 455e55971d0e..ae5c4aa6d269 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -889,7 +889,7 @@ static int platform_pm_restore_noirq(struct device *dev)
 
 #endif /* !CONFIG_HIBERNATION */
 
-static struct dev_pm_ops platform_dev_pm_ops = {
+static const struct dev_pm_ops platform_dev_pm_ops = {
         .prepare = platform_pm_prepare,
         .complete = platform_pm_complete,
         .suspend = platform_pm_suspend,
diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index 58a3e572f2c9..1b1a786b7dec 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -157,8 +157,9 @@ void device_pm_move_last(struct device *dev)
  *      @ops:   PM operations to choose from.
  *      @state: PM transition of the system being carried out.
  */
-static int pm_op(struct device *dev, struct dev_pm_ops *ops,
-                        pm_message_t state)
+static int pm_op(struct device *dev,
+                 const struct dev_pm_ops *ops,
+                 pm_message_t state)
 {
         int error = 0;
 
@@ -220,7 +221,8 @@ static int pm_op(struct device *dev, struct dev_pm_ops *ops,
  *      The operation is executed with interrupts disabled by the only remaining
  *      functional CPU in the system.
  */
-static int pm_noirq_op(struct device *dev, struct dev_pm_ops *ops,
+static int pm_noirq_op(struct device *dev,
+                        const struct dev_pm_ops *ops,
                         pm_message_t state)
 {
         int error = 0;
diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index d76c4c85367e..0c2ea44ae5e1 100644
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -575,7 +575,7 @@ static void pci_pm_complete(struct device *dev)
 static int pci_pm_suspend(struct device *dev)
 {
         struct pci_dev *pci_dev = to_pci_dev(dev);
-        struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
+        const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 
         if (pci_has_legacy_pm_support(pci_dev))
                 return pci_legacy_suspend(dev, PMSG_SUSPEND);
@@ -613,7 +613,7 @@ static int pci_pm_suspend(struct device *dev)
 static int pci_pm_suspend_noirq(struct device *dev)
 {
         struct pci_dev *pci_dev = to_pci_dev(dev);
-        struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
+        const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 
         if (pci_has_legacy_pm_support(pci_dev))
                 return pci_legacy_suspend_late(dev, PMSG_SUSPEND);
@@ -672,7 +672,7 @@ static int pci_pm_resume_noirq(struct device *dev)
 static int pci_pm_resume(struct device *dev)
 {
         struct pci_dev *pci_dev = to_pci_dev(dev);
-        struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
+        const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
         int error = 0;
 
         /*
@@ -711,7 +711,7 @@ static int pci_pm_resume(struct device *dev)
 static int pci_pm_freeze(struct device *dev)
 {
         struct pci_dev *pci_dev = to_pci_dev(dev);
-        struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
+        const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 
         if (pci_has_legacy_pm_support(pci_dev))
                 return pci_legacy_suspend(dev, PMSG_FREEZE);
@@ -780,7 +780,7 @@ static int pci_pm_thaw_noirq(struct device *dev)
 static int pci_pm_thaw(struct device *dev)
 {
         struct pci_dev *pci_dev = to_pci_dev(dev);
-        struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
+        const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
         int error = 0;
 
         if (pci_has_legacy_pm_support(pci_dev))
@@ -799,7 +799,7 @@ static int pci_pm_thaw(struct device *dev)
 static int pci_pm_poweroff(struct device *dev)
 {
         struct pci_dev *pci_dev = to_pci_dev(dev);
-        struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
+        const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 
         if (pci_has_legacy_pm_support(pci_dev))
                 return pci_legacy_suspend(dev, PMSG_HIBERNATE);
@@ -872,7 +872,7 @@ static int pci_pm_restore_noirq(struct device *dev)
 static int pci_pm_restore(struct device *dev)
 {
         struct pci_dev *pci_dev = to_pci_dev(dev);
-        struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
+        const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
         int error = 0;
 
         /*
@@ -910,7 +910,7 @@ static int pci_pm_restore(struct device *dev)
 
 #endif /* !CONFIG_HIBERNATION */
 
-struct dev_pm_ops pci_dev_pm_ops = {
+const struct dev_pm_ops pci_dev_pm_ops = {
         .prepare = pci_pm_prepare,
         .complete = pci_pm_complete,
         .suspend = pci_pm_suspend,
diff --git a/include/linux/device.h b/include/linux/device.h
index aebb81036db2..a28642975053 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -62,7 +62,7 @@ struct bus_type {
         int (*suspend)(struct device *dev, pm_message_t state);
         int (*resume)(struct device *dev);
 
-        struct dev_pm_ops *pm;
+        const struct dev_pm_ops *pm;
 
         struct bus_type_private *p;
 };
@@ -132,7 +132,7 @@ struct device_driver {
         int (*resume) (struct device *dev);
         struct attribute_group **groups;
 
-        struct dev_pm_ops *pm;
+        const struct dev_pm_ops *pm;
 
         struct driver_private *p;
 };
@@ -200,7 +200,8 @@ struct class {
         int (*suspend)(struct device *dev, pm_message_t state);
         int (*resume)(struct device *dev);
 
-        struct dev_pm_ops *pm;
+        const struct dev_pm_ops *pm;
+
         struct class_private *p;
 };
 
@@ -291,7 +292,7 @@ struct device_type {
         char *(*nodename)(struct device *dev);
         void (*release)(struct device *dev);
 
-        struct dev_pm_ops *pm;
+        const struct dev_pm_ops *pm;
 };
 
 /* interface for exporting device attributes */