[PATCH v2] PM: runtime: Drop status check from pm_runtime_force_resume()

[PATCH v2] PM: runtime: Drop status check from pm_runtime_force_resume()

[Rafael J. Wysocki]

From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Since pm_runtime_force_resume() requires pm_runtime_force_suspend() to
be called before it on the same device, the runtime PM status of the
device is RPM_SUSPENDED when it is called unless the device's runtime
PM status is changed somewhere else in the meantime.

However, even if that happens, the power.needs_force_resume
check is still required to pass and that flag is only set by
pm_runtime_force_suspend() once and it is cleared at the end of
pm_runtime_force_resume(), so it cannot be taken into account
twice in a row.

According to the above, the pm_runtime_status_suspended(dev) check in
pm_runtime_force_resume() is redundant, so drop it.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---

The previous version of this patch is here:

https://lore.kernel.org/linux-pm/6038511.MhkbZ0Pkbq@rjwysocki.net/

v1 -> v2: Minor changelog edits.

---
 drivers/base/power/runtime.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -1982,7 +1982,7 @@
 	int (*callback)(struct device *);
 	int ret = 0;
 
-	if (!pm_runtime_status_suspended(dev) || !dev->power.needs_force_resume)
+	if (!dev->power.needs_force_resume)
 		goto out;
 
 	/*

Re: [PATCH v2] PM: runtime: Drop status check from pm_runtime_force_resume()

[Ulf Hansson]

On Thu, 27 Feb 2025 at 11:56, Rafael J. Wysocki <rjw@rjwysocki.net> wrote:
>
> From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
>
> Since pm_runtime_force_resume() requires pm_runtime_force_suspend() to
> be called before it on the same device, the runtime PM status of the
> device is RPM_SUSPENDED when it is called unless the device's runtime
> PM status is changed somewhere else in the meantime.
>
> However, even if that happens, the power.needs_force_resume
> check is still required to pass and that flag is only set by
> pm_runtime_force_suspend() once and it is cleared at the end of
> pm_runtime_force_resume(), so it cannot be taken into account
> twice in a row.
>
> According to the above, the pm_runtime_status_suspended(dev) check in
> pm_runtime_force_resume() is redundant, so drop it.
>
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Seems reasonable to me! Please add:

Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>

Kind regards
Uffe

> ---
>
> The previous version of this patch is here:
>
> https://lore.kernel.org/linux-pm/6038511.MhkbZ0Pkbq@rjwysocki.net/
>
> v1 -> v2: Minor changelog edits.
>
> ---
>  drivers/base/power/runtime.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> --- a/drivers/base/power/runtime.c
> +++ b/drivers/base/power/runtime.c
> @@ -1982,7 +1982,7 @@
>         int (*callback)(struct device *);
>         int ret = 0;
>
> -       if (!pm_runtime_status_suspended(dev) || !dev->power.needs_force_resume)
> +       if (!dev->power.needs_force_resume)
>                 goto out;
>
>         /*
>
>
>