[PATCH 1/2] PCI: Avoid runtime resuming devices if system is shutting down

[Mario Limonciello]

When the system is going to S5 resuming devices is unnecessary at
best and may cause problems for power consumption at S5 at worst.

Check the target `system_state` in the pci driver shutdown() callback
and skip the runtime resume step if the system is being powered off.

Cc: mpearson-lenovo@xxxxxxxxx
Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxx>
---
 drivers/pci/pci-driver.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index 51ec9e7e784f..5a6f7a786952 100644
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -507,7 +507,9 @@ static void pci_device_shutdown(struct device *dev)
 	struct pci_dev *pci_dev = to_pci_dev(dev);
 	struct pci_driver *drv = pci_dev->driver;
 
-	pm_runtime_resume(dev);
+	/* If system will go to S5, don't wake up PCI devices for shutdown */
+	if (system_state != SYSTEM_POWER_OFF)
+		pm_runtime_resume(dev);
 
 	if (drv && drv->shutdown)
 		drv->shutdown(pci_dev);
-- 
2.34.1