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Power management fixes for 5.12-rc4

Browse Source 
- Revert ACPI PM commit that attempted to improve reboot handling
    on some systems, but it caused other systems to panic() during
    reboot (Josef Bacik).
 
  - Revert PM-runtime commit that attempted to improve the handling
    of suppliers during PM-runtime suspend of a consumer device, but
    it introduced a race condition potentially leading to unexpected
    behavior (Rafael Wysocki).
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Merge tag 'pm-5.12-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull power management fixes from Rafael Wysocki:
 "Revert two problematic commits.

  Specifics:

   - Revert ACPI PM commit that attempted to improve reboot handling on
     some systems, but it caused other systems to panic() during reboot
     (Josef Bacik)

   - Revert PM-runtime commit that attempted to improve the handling of
     suppliers during PM-runtime suspend of a consumer device, but it
     introduced a race condition potentially leading to unexpected
     behavior (Rafael Wysocki)"

* tag 'pm-5.12-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  Revert "PM: runtime: Update device status before letting suppliers suspend"
  Revert "PM: ACPI: reboot: Use S5 for reboot"
This commit is contained in:
Linus Torvalds 2021-03-19 10:00:10 -07:00
commit ec85720933
2 changed files with 25 additions and 39 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)
{
bool use_links = dev->power.links_count > 0;
bool get = false;
int retval, idx;
bool put;
bool use_links = dev->power.links_count > 0;
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. */
if (get) {
/*
* 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) {
idx = device_links_read_lock();
retval = rpm_get_suppliers(dev);
@ -355,36 +355,24 @@ static int __rpm_callback(int (*cb)(struct device *), struct device *dev)
if (dev->power.irq_safe) {
spin_lock(&dev->power.lock);
return retval;
}
} 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();
spin_lock_irq(&dev->power.lock);
fail:
rpm_put_suppliers(dev);
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);
device_links_read_unlock(idx);
}
spin_lock_irq(&dev->power.lock);
}

2
kernel/reboot.c
View File

@ -244,8 +244,6 @@ void migrate_to_reboot_cpu(void)
void kernel_restart(char *cmd)
{
kernel_restart_prepare(cmd);
if (pm_power_off_prepare)
pm_power_off_prepare();
migrate_to_reboot_cpu();
syscore_shutdown();
if (!cmd)