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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-04-12 13:58:17 +0000
committerBjorn Helgaas <bhelgaas@google.com>2013-04-15 14:15:43 -0600
commit769ba7212f2059ca9fe0c73371e3d415c8c1c529 (patch)
tree9a7e255336a71d79347bd5dceb67077570c6549f /drivers/pci
parentf6161aa153581da4a3867a2d1a7caf4be19b6ec9 (diff)
downloadlinux-769ba7212f2059ca9fe0c73371e3d415c8c1c529.tar.bz2
PCI/PM: Fix fallback to PCI_D0 in pci_platform_power_transition()
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] Reference: http://lkml.kernel.org/r/27806FC4E5928A408B78E88BBC67A2306F466BBA@ORSMSX101.amr.corp.intel.com Reported-by: Chris J. Benenati <chris.j.benenati@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Yinghai Lu <yinghai@kernel.org> Cc: <stable@vger.kernel.org> # v3.2+
Diffstat (limited to 'drivers/pci')
-rw-r--r--drivers/pci/pci.c12
1 files changed, 4 insertions, 8 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index b099e0025d2b..fc9bd81e8e3b 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -646,15 +646,11 @@ 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;
}