Patchwork [088/118] PCI/PM: Fix fallback to PCI_D0 in pci_platform_power_transition()

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Submitter Luis Henriques
Date May 7, 2013, 1:38 p.m.
Message ID <>
Download mbox | patch
Permalink /patch/242283/
State New
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Luis Henriques - May 7, 2013, 1:38 p.m. -stable review patch.  If anyone has any objections, please let me know.


From: "Rafael J. Wysocki" <>

commit 769ba7212f2059ca9fe0c73371e3d415c8c1c529 upstream.

Commit b51306c (PCI: Set device power state to PCI_D0 for device
without native PM support) modified pci_platform_power_transition()
by adding code causing dev->current_state for devices that don't
support native PCI PM but are power-manageable by the platform to be
changed to PCI_D0 regardless of the value returned by the preceding
platform_pci_set_power_state().  In particular, that also is done
if the platform_pci_set_power_state() has been successful, which
causes the correct power state of the device set by
pci_update_current_state() in that case to be overwritten by PCI_D0.

Fix that mistake by making the fallback to PCI_D0 only happen if
the platform_pci_set_power_state() has returned an error.

[bhelgaas: folded in Yinghai's simplification, added URL & stable info]
Reported-by: Chris J. Benenati <>
Signed-off-by: Rafael J. Wysocki <>
Signed-off-by: Bjorn Helgaas <>
Acked-by: Yinghai Lu <>
Signed-off-by: Luis Henriques <>
 drivers/pci/pci.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)


diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 447e834..fa7c0f0 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -674,15 +674,11 @@  static int pci_platform_power_transition(struct pci_dev *dev, pci_power_t state)
 		error = platform_pci_set_power_state(dev, state);
 		if (!error)
 			pci_update_current_state(dev, state);
-		/* Fall back to PCI_D0 if native PM is not supported */
-		if (!dev->pm_cap)
-			dev->current_state = PCI_D0;
-	} else {
+	} else
 		error = -ENODEV;
-		/* Fall back to PCI_D0 if native PM is not supported */
-		if (!dev->pm_cap)
-			dev->current_state = PCI_D0;
-	}
+	if (error && !dev->pm_cap) /* Fall back to PCI_D0 */
+		dev->current_state = PCI_D0;
 	return error;