lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

PM / Runtime: Add no_callbacks flag

Browse Source 
Some devices, such as USB interfaces, cannot be power-managed
independently of their parents, i.e., they cannot be put in low power
while the parent remains at full power.  This patch (as1425) creates a
new "no_callbacks" flag, which tells the PM core not to invoke the
runtime-PM callback routines for the such devices but instead to
assume that the callbacks always succeed.  In addition, the
non-debugging runtime-PM sysfs attributes for the devices are removed,
since they are pretty much meaningless.

The advantage of this scheme comes not so much from avoiding the
callbacks themselves, but rather from the fact that without the need
for a process context in which to run the callbacks, more work can be
done in interrupt context.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
This commit is contained in:
Alan Stern
2010-09-25 23:35:15 +02:00
committed by Rafael J. Wysocki
parent 140a6c9452
commit 7490e44239
6 changed files with 149 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
include/linux/pm_runtime.h
View File

@ -36,6 +36,7 @@ extern void pm_runtime_forbid(struct device *dev);
extern int pm_generic_runtime_idle(struct device *dev);
extern int pm_generic_runtime_suspend(struct device *dev);
extern int pm_generic_runtime_resume(struct device *dev);
extern void pm_runtime_no_callbacks(struct device *dev);
static inline bool pm_children_suspended(struct device *dev)
{
@ -110,6 +111,7 @@ static inline bool pm_runtime_suspended(struct device *dev) { return false; }
static inline int pm_generic_runtime_idle(struct device *dev) { return 0; }
static inline int pm_generic_runtime_suspend(struct device *dev) { return 0; }
static inline int pm_generic_runtime_resume(struct device *dev) { return 0; }
static inline void pm_runtime_no_callbacks(struct device *dev) {}
#endif /* !CONFIG_PM_RUNTIME */