On Wednesday, December 15, 2010, Rafael J. Wysocki wrote:
> On Wednesday, December 15, 2010, Alan Stern wrote:
> > On Wed, 15 Dec 2010, Rafael J. Wysocki wrote:
> >
> > > From: Rafael J. Wysocki <rjw@xxxxxxx>
> > > Subject: PM / Runtime: Fix pm_runtime_suspended()
> > >
> > > pm_runtime_suspended() shouldn't return true if the runtime PM of the
> > > given device is disabled.
> > >
> > > Signed-off-by: Rafael J. Wysocki <rjw@xxxxxxx>
> > > ---
> > > include/linux/pm_runtime.h | 3 ++-
> > > 1 file changed, 2 insertions(+), 1 deletion(-)
> > >
> > > Index: linux-2.6/include/linux/pm_runtime.h
> > > ===================================================================
> > > --- linux-2.6.orig/include/linux/pm_runtime.h
> > > +++ linux-2.6/include/linux/pm_runtime.h
> > > @@ -78,7 +78,8 @@ static inline void device_set_run_wake(s
> > >
> > > static inline bool pm_runtime_suspended(struct device *dev)
> > > {
> > > - return dev->power.runtime_status == RPM_SUSPENDED;
> > > + return dev->power.runtime_status == RPM_SUSPENDED
> > > + && !dev->power.disable_depth;
> > > }
> >
> > You need to update the documentation entry for pm_runtime_suspended as
> > well.
>
> Yes, I also need to rework the changelog to explain what exactly the problem is.
Updated patch is appended.
Thanks,
Rafael
---
From: Rafael J. Wysocki <rjw@xxxxxxx>
Subject: PM / Runtime: Fix pm_runtime_suspended()
There are some situations (e.g. in __pm_generic_call()), where
pm_runtime_suspended() is used to decide whether or not to execute
a device's (system) ->suspend() callback. The callback is not
executed if pm_runtime_suspended() returns true, but it does so
for devices that don't even support runtime PM, because the
power.disable_depth device field is ignored by it. This leads to
problems (i.e. devices are not suspened when they should), so rework
pm_runtime_suspended() so that it returns false if the device's
power.disable_depth field is different from zero.
Signed-off-by: Rafael J. Wysocki <rjw@xxxxxxx>
---
Documentation/power/runtime_pm.txt | 4 ++--
include/linux/pm_runtime.h | 3 ++-
2 files changed, 4 insertions(+), 3 deletions(-)
Index: linux-2.6/include/linux/pm_runtime.h
===================================================================
--- linux-2.6.orig/include/linux/pm_runtime.h
+++ linux-2.6/include/linux/pm_runtime.h
@@ -78,7 +78,8 @@ static inline void device_set_run_wake(s
static inline bool pm_runtime_suspended(struct device *dev)
{
- return dev->power.runtime_status == RPM_SUSPENDED;
+ return dev->power.runtime_status == RPM_SUSPENDED
+ && !dev->power.disable_depth;
}
static inline void pm_runtime_mark_last_busy(struct device *dev)
Index: linux-2.6/Documentation/power/runtime_pm.txt
===================================================================
--- linux-2.6.orig/Documentation/power/runtime_pm.txt
+++ linux-2.6/Documentation/power/runtime_pm.txt
@@ -396,8 +396,8 @@ drivers/base/power/runtime.c and include
zero)
bool pm_runtime_suspended(struct device *dev);
- - return true if the device's runtime PM status is 'suspended', or false
- otherwise
+ - return true if the device's runtime PM status is 'suspended' and its
+ 'power.disable_depth' field is equal to zero, or false otherwise
void pm_runtime_allow(struct device *dev);
- set the power.runtime_auto flag for the device and decrease its usage
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