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Power management fixes for 5.12-rc2

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- Make the runtime PM core code avoid attempting to suspend
    supplier devices before updating the PM-runtime status of
    a consumer to "suspended" (Rafael Wysocki).
 
  - Fix DTPM (Dynamic Thermal Power Management) root node
    initialization and label that feature as EXPERIMENTAL in
    Kconfig (Daniel Lezcano).
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Merge tag 'pm-5.12-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull power management fixes from Rafael Wysocki:
 "These fix the usage of device links in the runtime PM core code and
  update the DTPM (Dynamic Thermal Power Management) feature added
  recently.

  Specifics:

   - Make the runtime PM core code avoid attempting to suspend supplier
     devices before updating the PM-runtime status of a consumer to
     'suspended' (Rafael Wysocki).

   - Fix DTPM (Dynamic Thermal Power Management) root node
     initialization and label that feature as EXPERIMENTAL in Kconfig
     (Daniel Lezcano)"

* tag 'pm-5.12-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  powercap/drivers/dtpm: Add the experimental label to the option description
  powercap/drivers/dtpm: Fix root node initialization
  PM: runtime: Update device status before letting suppliers suspend
This commit is contained in:
Linus Torvalds 2021-03-05 12:36:33 -08:00
commit 6d47254c06
3 changed files with 41 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

62
drivers/base/power/runtime.c
View File

@ -325,22 +325,22 @@ static void rpm_put_suppliers(struct device *dev)
static int __rpm_callback(int (*cb)(struct device *), struct device *dev)
__releases(&dev->power.lock) __acquires(&dev->power.lock)
{
int retval, idx;
bool use_links = dev->power.links_count > 0;
bool get = false;
int retval, idx;
bool put;
if (dev->power.irq_safe) {
spin_unlock(&dev->power.lock);
} else if (!use_links) {
spin_unlock_irq(&dev->power.lock);
} else {
get = dev->power.runtime_status == RPM_RESUMING;
spin_unlock_irq(&dev->power.lock);
/*
* Resume suppliers if necessary.
*
* The device's runtime PM status cannot change until this
* routine returns, so it is safe to read the status outside of
* the lock.
*/
if (use_links && dev->power.runtime_status == RPM_RESUMING) {
/* Resume suppliers if necessary. */
if (get) {
idx = device_links_read_lock();
retval = rpm_get_suppliers(dev);
@ -355,24 +355,36 @@ static int __rpm_callback(int (*cb)(struct device *), struct device *dev)
if (dev->power.irq_safe) {
spin_lock(&dev->power.lock);
} else {
/*
* If the device is suspending and the callback has returned
* success, drop the usage counters of the suppliers that have
* been reference counted on its resume.
*
* Do that if resume fails too.
*/
if (use_links
&& ((dev->power.runtime_status == RPM_SUSPENDING && !retval)
|| (dev->power.runtime_status == RPM_RESUMING && retval))) {
idx = device_links_read_lock();
return retval;
}
fail:
rpm_put_suppliers(dev);
spin_lock_irq(&dev->power.lock);
device_links_read_unlock(idx);
}
if (!use_links)
return retval;
/*
* If the device is suspending and the callback has returned success,
* drop the usage counters of the suppliers that have been reference
* counted on its resume.
*
* Do that if the resume fails too.
*/
put = dev->power.runtime_status == RPM_SUSPENDING && !retval;
if (put)
__update_runtime_status(dev, RPM_SUSPENDED);
else
put = get && retval;
if (put) {
spin_unlock_irq(&dev->power.lock);
idx = device_links_read_lock();
fail:
rpm_put_suppliers(dev);
device_links_read_unlock(idx);
spin_lock_irq(&dev->power.lock);
}

2
drivers/powercap/Kconfig
View File

@ -45,7 +45,7 @@ config IDLE_INJECT
on a per CPU basis.
config DTPM
bool "Power capping for Dynamic Thermal Power Management"
bool "Power capping for Dynamic Thermal Power Management (EXPERIMENTAL)"
help
This enables support for the power capping for the dynamic
thermal power management userspace engine.

3
drivers/powercap/dtpm.c
View File

@ -207,6 +207,9 @@ int dtpm_release_zone(struct powercap_zone *pcz)
if (dtpm->ops)
dtpm->ops->release(dtpm);
if (root == dtpm)
root = NULL;
kfree(dtpm);
return 0;