PM: Do not use the syscore flag for runtime PM

The syscore device PM flag used to mark the devices (belonging to
PM domains) that should never be turned off, except for the system
core (syscore) suspend/hibernation and resume stages, need not be
accessed by the runtime PM core functions, because all of the devices
it is set for need to be marked as "irq safe" anyway and are
protected from being turned off by runtime PM by ensuring that their
usage counters are always set.

For this reason, make the syscore flag system-wide PM-specific
and simplify the code used for manipulating it, because it need not
acquire the device's power.lock any more.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>

3 files changed, 2 insertions, 17 deletions

diff --git a/drivers/base/power/common.c b/drivers/base/power/common.c
index cf7a85134730..39c32529b833 100644
--- a/drivers/base/power/common.c
+++ b/drivers/base/power/common.c
@@ -83,18 +83,3 @@ int dev_pm_put_subsys_data(struct device *dev)
         return ret;
 }
 EXPORT_SYMBOL_GPL(dev_pm_put_subsys_data);
-
-/**
- * dev_pm_syscore_device - Set/unset the given device's power.syscore flag.
- * @dev: Device whose flag is to be modified.
- * @val: New value of the flag.
- */
-void dev_pm_syscore_device(struct device *dev, bool val)
-{
-        unsigned long flags;
-
-        spin_lock_irqsave(&dev->power.lock, flags);
-        dev->power.syscore = val;
-        spin_unlock_irqrestore(&dev->power.lock, flags);
-}
-EXPORT_SYMBOL_GPL(dev_pm_syscore_device);
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index d7e71b5b080e..5f4606f13be6 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -442,7 +442,7 @@ static int pm_genpd_poweroff(struct generic_pm_domain *genpd)
         not_suspended = 0;
         list_for_each_entry(pdd, &genpd->dev_list, list_node)
                 if (pdd->dev->driver && (!pm_runtime_suspended(pdd->dev)
-                    || pdd->dev->power.irq_safe || pdd->dev->power.syscore))
+                    || pdd->dev->power.irq_safe))
                         not_suspended++;
 
         if (not_suspended > genpd->in_progress)
diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
index bd1de3980919..7d9c1cb1c39a 100644
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -134,7 +134,7 @@ static int rpm_check_suspend_allowed(struct device *dev)
 
         if (dev->power.runtime_error)
                 retval = -EINVAL;
-        else if (dev->power.disable_depth > 0 || dev->power.syscore)
+        else if (dev->power.disable_depth > 0)
                 retval = -EACCES;
         else if (atomic_read(&dev->power.usage_count) > 0)
                 retval = -EAGAIN;