PM / Runtime: Lenient generic runtime pm callbacks

Allow drivers, that belong to subsystems which use the generic
runtime pm callbacks, not to define runtime pm suspend/resume handlers,
by implicitly assuming success in such cases.

This is needed to eliminate nop handlers that would otherwise be
necessary by drivers which enable runtime pm, but don't need
to do anything when their devices are runtime-suspended/resumed.

Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>
Acked-by: Kevin Hilman <khilman@deeprootsystems.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>

diff --git a/drivers/base/power/generic_ops.c b/drivers/base/power/generic_ops.c
index 4b29d4981253a22d8386b50dd74ca1a046ca6682..81f2c84697f450544f3dfef66b1726cdfac83728 100644 (file)
--- a/drivers/base/power/generic_ops.c
+++ b/drivers/base/power/generic_ops.c
@@ -46,7 +46,7 @@ int pm_generic_runtime_suspend(struct device *dev)
        const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
        int ret;
 
-       ret = pm && pm->runtime_suspend ? pm->runtime_suspend(dev) : -EINVAL;
+       ret = pm && pm->runtime_suspend ? pm->runtime_suspend(dev) : 0;
 
        return ret;
 }
@@ -65,7 +65,7 @@ int pm_generic_runtime_resume(struct device *dev)
        const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
        int ret;
 
-       ret = pm && pm->runtime_resume ? pm->runtime_resume(dev) : -EINVAL;
+       ret = pm && pm->runtime_resume ? pm->runtime_resume(dev) : 0;
 
        return ret;
 }