On Thu, Jun 26, 2025 at 10:59 PM Bjorn Helgaas <helgaas@xxxxxxxxxx> wrote:
>
> On Thu, Jun 26, 2025 at 08:15:05PM +0200, Rafael J. Wysocki wrote:
> > From: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
> >
> > The PCI bus type does not expect its runtime PM callbacks,
> > pci_pm_runtime_suspend() and pci_pm_runtime_resume(), to be invoked at
> > any point during system-wide suspend and resume, so make it express
> > that expectation by setting power.strict_midlayer for all PCI devices
> > in pci_pm_prepare() and clear it in pci_pm_complete().
> >
> > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
>
> Previous PM-related patches in drivers/pci/ use a subject line like:
>
> PCI/PM: ...
Sure.
> Would be cool if there were hints about what
> dev_pm_set_strict_midlayer() means. Maybe the comment in
> get_callback() is enough, but it takes a little work to find it.
OK, I can add a kerneldoc comment to it.
> Acked-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Thanks!
> > ---
> >
> > v1 -> v2:
> > * Set and clear the new flag in "prepare" and "complete" to allow
> > pm_runtime_force_suspend() invoked from driver remove callbacks to
> > work.
> > * Update subject and changelog.
> >
> > ---
> > drivers/pci/pci-driver.c | 4 ++++
> > 1 file changed, 4 insertions(+)
> >
> > --- a/drivers/pci/pci-driver.c
> > +++ b/drivers/pci/pci-driver.c
> > @@ -708,6 +708,8 @@
> > struct pci_dev *pci_dev = to_pci_dev(dev);
> > const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
> >
> > + dev_pm_set_strict_midlayer(dev, true);
> > +
> > if (pm && pm->prepare) {
> > int error = pm->prepare(dev);
> > if (error < 0)
> > @@ -749,6 +751,8 @@
> > if (pci_dev->current_state < pre_sleep_state)
> > pm_request_resume(dev);
> > }
> > +
> > + dev_pm_set_strict_midlayer(dev, false);
> > }
> >
> > #else /* !CONFIG_PM_SLEEP */
> >
> >
> >
>
