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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2016-10-30 19:32:43 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-10-31 20:42:51 +0300
commitbaa8809f60971d10220dfe79248f54b2b265f003 (patch)
tree51a4d0c63734bdd7923c025e9ed4e0dd537e3c76 /include/linux/pm_runtime.h
parent21d5c57b3726166421251e94dabab047baaf8ce4 (diff)
downloadlinux-baa8809f60971d10220dfe79248f54b2b265f003.tar.xz
PM / runtime: Optimize the use of device links
If the device has no links to suppliers that should be used for runtime PM (links with DEVICE_LINK_PM_RUNTIME set), there is no reason to walk the list of suppliers for that device during runtime suspend and resume. Add a simple mechanism to detect that case and possibly avoid the extra unnecessary overhead. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/pm_runtime.h')
-rw-r--r--include/linux/pm_runtime.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/pm_runtime.h b/include/linux/pm_runtime.h
index c2ee87138e4a..73814877537d 100644
--- a/include/linux/pm_runtime.h
+++ b/include/linux/pm_runtime.h
@@ -58,6 +58,8 @@ extern void pm_runtime_set_memalloc_noio(struct device *dev, bool enable);
extern void pm_runtime_clean_up_links(struct device *dev);
extern void pm_runtime_get_suppliers(struct device *dev);
extern void pm_runtime_put_suppliers(struct device *dev);
+extern void pm_runtime_new_link(struct device *dev);
+extern void pm_runtime_drop_link(struct device *dev);
static inline void pm_suspend_ignore_children(struct device *dev, bool enable)
{
@@ -192,6 +194,8 @@ static inline void pm_runtime_set_memalloc_noio(struct device *dev,
static inline void pm_runtime_clean_up_links(struct device *dev) {}
static inline void pm_runtime_get_suppliers(struct device *dev) {}
static inline void pm_runtime_put_suppliers(struct device *dev) {}
+static inline void pm_runtime_new_link(struct device *dev) {}
+static inline void pm_runtime_drop_link(struct device *dev) {}
#endif /* !CONFIG_PM */