Re: [PATCH v4 1/2] PCI/PM: refactor pci_pm_suspend_noirq()

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On 3/25/2022 8:50 PM, Rajvi Jingar wrote:
The state of the device is saved during pci_pm_suspend_noirq(), if it
has not already been saved, regardless of the skip_bus_pm flag value. So
skip_bus_pm check is removed before saving the device state.

Signed-off-by: Rajvi Jingar <rajvi.jingar@xxxxxxxxx>
Suggested-by: David E. Box <david.e.box@xxxxxxxxxxxxxxx>

Sorry for the delay here.

Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>


---
  v1 -> v2: add comments to the changes
  v2 -> v3: move changelog after "---" marker
  v3 -> v4: add "---" marker after changelog
---
  drivers/pci/pci-driver.c | 18 ++++++------------
  1 file changed, 6 insertions(+), 12 deletions(-)

diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index 4ceeb75fc899..8b55a90126a2 100644
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -845,20 +845,14 @@ static int pci_pm_suspend_noirq(struct device *dev)
  		}
  	}
- if (pci_dev->skip_bus_pm) {
+	if (!pci_dev->state_saved) {
+		pci_save_state(pci_dev);
  		/*
-		 * Either the device is a bridge with a child in D0 below it, or
-		 * the function is running for the second time in a row without
-		 * going through full resume, which is possible only during
-		 * suspend-to-idle in a spurious wakeup case.  The device should
-		 * be in D0 at this point, but if it is a bridge, it may be
-		 * necessary to save its state.
+		 * If the device is a bridge with a child in D0 below it, it needs to
+		 * stay in D0, so check skip_bus_pm to avoid putting it into a
+		 * low-power state in that case.
  		 */
-		if (!pci_dev->state_saved)
-			pci_save_state(pci_dev);
-	} else if (!pci_dev->state_saved) {
-		pci_save_state(pci_dev);
-		if (pci_power_manageable(pci_dev))
+		if (!pci_dev->skip_bus_pm && pci_power_manageable(pci_dev))
  			pci_prepare_to_sleep(pci_dev);
  	}





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