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PM: sleep: core: Synchronize runtime PM status of parents and children

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Commit 6e176bf8d4 ("PM: sleep: core: Do not skip callbacks in the
resume phase") overlooked the case in which the parent of a device with
DPM_FLAG_SMART_SUSPEND set did not use that flag and could be runtime-
suspended before a transition into a system-wide sleep state.  In that
case, if the child is resumed during the subsequent transition from
that state into the working state, its runtime PM status will be set to
RPM_ACTIVE, but the runtime PM status of the parent will not be updated
accordingly, even though the parent will be resumed too, because of the
dev_pm_skip_suspend() check in device_resume_noirq().

Address this problem by tracking the need to set the runtime PM status
to RPM_ACTIVE during system-wide resume transitions for devices with
DPM_FLAG_SMART_SUSPEND set and all of the devices depended on by them.

Fixes: 6e176bf8d4 ("PM: sleep: core: Do not skip callbacks in the resume phase")
Closes: https://lore.kernel.org/linux-pm/Z30p2Etwf3F2AUvD@hovoldconsulting.com/
Reported-by: Johan Hovold <johan@kernel.org>
Tested-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Johan Hovold <johan+linaro@kernel.org>
Tested-by: Johan Hovold <johan+linaro@kernel.org>
Link: https://patch.msgid.link/12619233.O9o76ZdvQC@rjwysocki.net
This commit is contained in:
Rafael J. Wysocki 2025-01-28 20:24:41 +01:00
parent 4891cd3eba
commit 3775fc538f
2 changed files with 21 additions and 9 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

29
drivers/base/power/main.c
View file

@ -656,13 +656,15 @@ static void device_resume_noirq(struct device *dev, pm_message_t state, bool asy
* so change its status accordingly.
*
* Otherwise, the device is going to be resumed, so set its PM-runtime
* status to "active", but do that only if DPM_FLAG_SMART_SUSPEND is set
* to avoid confusing drivers that don't use it.
* status to "active" unless its power.set_active flag is clear, in
* which case it is not necessary to update its PM-runtime status.
*/
if (skip_resume)
if (skip_resume) {
pm_runtime_set_suspended(dev);
else if (dev_pm_skip_suspend(dev))
} else if (dev->power.set_active) {
pm_runtime_set_active(dev);
dev->power.set_active = false;
}
if (dev->pm_domain) {
info = "noirq power domain ";
@ -1189,18 +1191,24 @@ static pm_message_t resume_event(pm_message_t sleep_state)
return PMSG_ON;
}
static void dpm_superior_set_must_resume(struct device *dev)
static void dpm_superior_set_must_resume(struct device *dev, bool set_active)
{
struct device_link *link;
int idx;
if (dev->parent)
if (dev->parent) {
dev->parent->power.must_resume = true;
if (set_active)
dev->parent->power.set_active = true;
}
idx = device_links_read_lock();
list_for_each_entry_rcu_locked(link, &dev->links.suppliers, c_node)
list_for_each_entry_rcu_locked(link, &dev->links.suppliers, c_node) {
link->supplier->power.must_resume = true;
if (set_active)
link->supplier->power.set_active = true;
}
device_links_read_unlock(idx);
}
@ -1278,8 +1286,11 @@ Skip:
dev->power.may_skip_resume))
dev->power.must_resume = true;
if (dev->power.must_resume)
dpm_superior_set_must_resume(dev);
if (dev->power.must_resume) {
dev->power.set_active = dev->power.set_active ||
dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND);
dpm_superior_set_must_resume(dev, dev->power.set_active);
}
Complete:
complete_all(&dev->power.completion);

1
include/linux/pm.h
View file

@ -679,6 +679,7 @@ struct dev_pm_info {
bool no_pm_callbacks:1; /* Owned by the PM core */
bool async_in_progress:1; /* Owned by the PM core */
bool must_resume:1; /* Owned by the PM core */
bool set_active:1; /* Owned by the PM core */
bool may_skip_resume:1; /* Set by subsystems */
#else
bool should_wakeup:1;