diff options
Diffstat (limited to 'include/linux/pm.h')
| -rw-r--r-- | include/linux/pm.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/pm.h b/include/linux/pm.h index 73c610573a7..d6dd6f612b8 100644 --- a/include/linux/pm.h +++ b/include/linux/pm.h @@ -320,6 +320,15 @@ const struct dev_pm_ops name = { \ /* * Use this for defining a set of PM operations to be used in all situations * (sustem suspend, hibernation or runtime PM). + * NOTE: In general, system suspend callbacks, .suspend() and .resume(), should + * be different from the corresponding runtime PM callbacks, .runtime_suspend(), + * and .runtime_resume(), because .runtime_suspend() always works on an already + * quiescent device, while .suspend() should assume that the device may be doing + * something when it is called (it should ensure that the device will be + * quiescent after it has returned). Therefore it's better to point the "late" + * suspend and "early" resume callback pointers, .suspend_late() and + * .resume_early(), to the same routines as .runtime_suspend() and + * .runtime_resume(), respectively (and analogously for hibernation). */ #define UNIVERSAL_DEV_PM_OPS(name, suspend_fn, resume_fn, idle_fn) \ const struct dev_pm_ops name = { \ |