projects/linux·commit c0006dc6

Merge tag 'pm-5.14-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

c0006dc6 · Linus Torvalds <[email protected]> · 2021-08-27 12:06:51 -07:00

Pull power management fixes from Rafael Wysocki:
 "These fix two issues introduced during this cycle, one of which is a
  regression and the other one affects new code.

  Specifics:

   - Prevent the operating performance points (OPP) code from crashing
     when some entries in the table of required OPPs are set to error
     pointer values (Marijn Suijten)

   - Prevent the generic power domains (genpd) framework from
     incorrectly overriding the performance state of a device set by its
     driver while it is runtime-suspended or when runtime PM of it is
     disabled (Dmitry Osipenko)"

* tag 'pm-5.14-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  PM: domains: Improve runtime PM performance state handling
  opp: core: Check for pending links before reading required_opp pointers
Commit
c0006dc6957ef0b5d3e785556f30f928af05ab0c
Parents
425bec00 · 7ee5fd12

Merge commit. Changes below are compared with the first parent: 425bec00.

Changes

2 files changed · +12 −6

FileStatusAddDelContent
drivers/base/power/domain.cmodified+8−2View file
drivers/opp/core.cmodified+4−4View file

drivers/base/power/domain.c

View file
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index a934c67..f10688e 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -435,7 +435,7 @@ static void genpd_restore_performance_state(struct device *dev,
int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state)
{
struct generic_pm_domain *genpd;
- int ret;
+ int ret = 0;
genpd = dev_to_genpd_safe(dev);
if (!genpd)
@@ -446,7 +446,13 @@ int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state)
return -EINVAL;
genpd_lock(genpd);
- ret = genpd_set_performance_state(dev, state);
+ if (pm_runtime_suspended(dev)) {
+ dev_gpd_data(dev)->rpm_pstate = state;
+ } else {
+ ret = genpd_set_performance_state(dev, state);
+ if (!ret)
+ dev_gpd_data(dev)->rpm_pstate = 0;
+ }
genpd_unlock(genpd);
return ret;

drivers/opp/core.c

View file
diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index 5543c54..04b4691 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -893,6 +893,10 @@ static int _set_required_opps(struct device *dev,
if (!required_opp_tables)
return 0;
+ /* required-opps not fully initialized yet */
+ if (lazy_linking_pending(opp_table))
+ return -EBUSY;
+
/*
* We only support genpd's OPPs in the "required-opps" for now, as we
* don't know much about other use cases. Error out if the required OPP
@@ -903,10 +907,6 @@ static int _set_required_opps(struct device *dev,
return -ENOENT;
}
- /* required-opps not fully initialized yet */
- if (lazy_linking_pending(opp_table))
- return -EBUSY;
-
/* Single genpd case */
if (!genpd_virt_devs)
return _set_required_opp(dev, dev, opp, 0);