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Wysocki" To: Linux PM Cc: LKML , Linux ACPI , Linux PCI , Ulf Hansson , Mika Westerberg , Bjorn Helgaas Subject: [PATCH v3 9/9] PCI/PM: Set power.strict_midlayer in pci_pm_init() Date: Fri, 27 Jun 2025 21:29:16 +0200 Message-ID: <1925097.atdPhlSkOF@rjwysocki.net> In-Reply-To: <5018768.GXAFRqVoOG@rjwysocki.net> References: <5018768.GXAFRqVoOG@rjwysocki.net> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="UTF-8" X-CLIENT-IP: 5.63.189.50 X-CLIENT-HOSTNAME: 5.63.189.50 X-VADE-SPAMSTATE: clean X-VADE-SPAMCAUSE: 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 X-DCC--Metrics: v370.home.net.pl 1024; Body=7 Fuz1=7 Fuz2=7 From: Rafael J. Wysocki The PCI bus type does not expect its runtime PM suspend callback function, pci_pm_runtime_suspend(), to be invoked at all during system- wide suspend and resume, and it does not expect its runtime resume callback function, pci_pm_runtime_resume(), to be invoked at any point when runtime PM is disabled for the given device 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 Acked-by: Bjorn Helgaas --- v2 -> v3: * Update subject prefix (Bjorn). * Update the changelog to be more precise. * Add Acked-by from Bjorn. 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 */