diff options
| author |   Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2016-10-30 17:32:43 +0100 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-10-31 11:42:51 -0600 |
| commit | baa8809f60971d10220dfe79248f54b2b265f003 (patch) | |
| tree | 51a4d0c63734bdd7923c025e9ed4e0dd537e3c76 /include/linux | |
| parent | PM / runtime: Use device links (diff) | |
| download | linux-dev-baa8809f60971d10220dfe79248f54b2b265f003.tar.xz linux-dev-baa8809f60971d10220dfe79248f54b2b265f003.zip | |
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')
| -rw-r--r-- | include/linux/pm.h | 1 | ||||
| -rw-r--r-- | include/linux/pm_runtime.h | 4 |
2 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/pm.h b/include/linux/pm.h index 721a70241fcd..ccfe00ecc7e6 100644 --- a/include/linux/pm.h +++ b/include/linux/pm.h @@ -597,6 +597,7 @@ struct dev_pm_info { unsigned int use_autosuspend:1; unsigned int timer_autosuspends:1; unsigned int memalloc_noio:1; + unsigned int links_count; enum rpm_request request; enum rpm_status runtime_status; int runtime_error; 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 */ |