5.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: Rafael J. Wysocki rafael.j.wysocki@intel.com
[ Upstream commit eeb87d17aceab7803a5a5bcb6cf2817b745157cf ]
The check before setting power.must_resume in device_suspend_noirq() does not take power.child_count into account, but it should do that, so use pm_runtime_need_not_resume() in it for this purpose and adjust the comment next to it accordingly.
Fixes: 107d47b2b95e ("PM: sleep: core: Simplify the SMART_SUSPEND flag handling") Signed-off-by: Rafael J. Wysocki rafael.j.wysocki@intel.com Reviewed-by: Ulf Hansson ulf.hansson@linaro.org Link: https://patch.msgid.link/3353728.44csPzL39Z@rjwysocki.net Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/base/power/main.c | 13 ++++++------- drivers/base/power/runtime.c | 2 +- include/linux/pm_runtime.h | 2 ++ 3 files changed, 9 insertions(+), 8 deletions(-)
diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c index 185ea0d93a5e5..8586651320901 100644 --- a/drivers/base/power/main.c +++ b/drivers/base/power/main.c @@ -1239,14 +1239,13 @@ static int __device_suspend_noirq(struct device *dev, pm_message_t state, bool a dev->power.is_noirq_suspended = true;
/* - * Skipping the resume of devices that were in use right before the - * system suspend (as indicated by their PM-runtime usage counters) - * would be suboptimal. Also resume them if doing that is not allowed - * to be skipped. + * Devices must be resumed unless they are explicitly allowed to be left + * in suspend, but even in that case skipping the resume of devices that + * were in use right before the system suspend (as indicated by their + * runtime PM usage counters and child counters) would be suboptimal. */ - if (atomic_read(&dev->power.usage_count) > 1 || - !(dev_pm_test_driver_flags(dev, DPM_FLAG_MAY_SKIP_RESUME) && - dev->power.may_skip_resume)) + if (!(dev_pm_test_driver_flags(dev, DPM_FLAG_MAY_SKIP_RESUME) && + dev->power.may_skip_resume) || !pm_runtime_need_not_resume(dev)) dev->power.must_resume = true;
if (dev->power.must_resume) diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c index 6699096ff2fa6..edee7f1af1cec 100644 --- a/drivers/base/power/runtime.c +++ b/drivers/base/power/runtime.c @@ -1809,7 +1809,7 @@ void pm_runtime_drop_link(struct device_link *link) pm_request_idle(link->supplier); }
-static bool pm_runtime_need_not_resume(struct device *dev) +bool pm_runtime_need_not_resume(struct device *dev) { return atomic_read(&dev->power.usage_count) <= 1 && (atomic_read(&dev->power.child_count) == 0 || diff --git a/include/linux/pm_runtime.h b/include/linux/pm_runtime.h index 9a10b6bac4a71..ed01ae76e2fa5 100644 --- a/include/linux/pm_runtime.h +++ b/include/linux/pm_runtime.h @@ -46,6 +46,7 @@ static inline bool queue_pm_work(struct work_struct *work)
extern int pm_generic_runtime_suspend(struct device *dev); extern int pm_generic_runtime_resume(struct device *dev); +extern bool pm_runtime_need_not_resume(struct device *dev); extern int pm_runtime_force_suspend(struct device *dev); extern int pm_runtime_force_resume(struct device *dev);
@@ -234,6 +235,7 @@ static inline bool queue_pm_work(struct work_struct *work) { return false; }
static inline int pm_generic_runtime_suspend(struct device *dev) { return 0; } static inline int pm_generic_runtime_resume(struct device *dev) { return 0; } +static inline bool pm_runtime_need_not_resume(struct device *dev) {return true; } static inline int pm_runtime_force_suspend(struct device *dev) { return 0; } static inline int pm_runtime_force_resume(struct device *dev) { return 0; }