Driver Core: Rework platform suspend/resume, print warning

This patch reworks the platform driver code for legacy
suspend and resume to avoid installing callbacks in
struct device_driver. A warning is also added telling
users to update the platform driver to use dev_pm_ops.

The functions platform_legacy_suspend()/resume() directly
call suspend and resume callbacks in struct platform_driver
instead of wrapping things in platform_drv_suspend()/resume().

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 8b4708e06244b2ba0b61b241b2ffd1d55b18f444..ead3f64c41d0506774788860f0f2232f22c9ce0a 100644 (file)
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -469,22 +469,6 @@ static void platform_drv_shutdown(struct device *_dev)
        drv->shutdown(dev);
 }
 
-static int platform_drv_suspend(struct device *_dev, pm_message_t state)
-{
-       struct platform_driver *drv = to_platform_driver(_dev->driver);
-       struct platform_device *dev = to_platform_device(_dev);
-
-       return drv->suspend(dev, state);
-}
-
-static int platform_drv_resume(struct device *_dev)
-{
-       struct platform_driver *drv = to_platform_driver(_dev->driver);
-       struct platform_device *dev = to_platform_device(_dev);
-
-       return drv->resume(dev);
-}
-
 /**
  * platform_driver_register
  * @drv: platform driver structure
@@ -498,10 +482,10 @@ int platform_driver_register(struct platform_driver *drv)
                drv->driver.remove = platform_drv_remove;
        if (drv->shutdown)
                drv->driver.shutdown = platform_drv_shutdown;
-       if (drv->suspend)
-               drv->driver.suspend = platform_drv_suspend;
-       if (drv->resume)
-               drv->driver.resume = platform_drv_resume;
+       if (drv->suspend || drv->resume)
+               pr_warning("Platform driver '%s' needs updating - please use "
+                       "dev_pm_ops\n", drv->driver.name);
+
        return driver_register(&drv->driver);
 }
 EXPORT_SYMBOL_GPL(platform_driver_register);
@@ -633,10 +617,12 @@ static int platform_match(struct device *dev, struct device_driver *drv)
 
 static int platform_legacy_suspend(struct device *dev, pm_message_t mesg)
 {
+       struct platform_driver *pdrv = to_platform_driver(dev->driver);
+       struct platform_device *pdev = to_platform_device(dev);
        int ret = 0;
 
-       if (dev->driver && dev->driver->suspend)
-               ret = dev->driver->suspend(dev, mesg);
+       if (dev->driver && pdrv->suspend)
+               ret = pdrv->suspend(pdev, mesg);
 
        return ret;
 }
@@ -667,10 +653,12 @@ static int platform_legacy_resume_early(struct device *dev)
 
 static int platform_legacy_resume(struct device *dev)
 {
+       struct platform_driver *pdrv = to_platform_driver(dev->driver);
+       struct platform_device *pdev = to_platform_device(dev);
        int ret = 0;
 
-       if (dev->driver && dev->driver->resume)
-               ret = dev->driver->resume(dev);
+       if (dev->driver && pdrv->resume)
+               ret = pdrv->resume(pdev);
 
        return ret;
 }