PCI: Ensure we re-enable devices on resume

commit cc2893b6af5265baa1d68b17b136cffca9e40cfa upstream.

If the firmware puts a device back into D0 state at resume time, we'll
update its state in resume_noirq and thus skip the platform resume code.
Calling that code twice should be safe and we ought to avoid getting to
that point anyway, so remove the check and also allow the platform pci
code to be called for D0.

Fixes USB not being powered after resume on recent Lenovo machines.

Acked-by: Alex Chiang <achiang@canonical.com>
Acked-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index bd667d20dbb7b9dcc2502089409216d13649dafe..595d03ae192197467c2059834a68dad75cdf5d27 100644 (file)
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -601,7 +601,7 @@ static void __pci_start_power_transition(struct pci_dev *dev, pci_power_t state)
  */
 int __pci_complete_power_transition(struct pci_dev *dev, pci_power_t state)
 {
-       return state > PCI_D0 ?
+       return state >= PCI_D0 ?
                        pci_platform_power_transition(dev, state) : -EINVAL;
 }
 EXPORT_SYMBOL_GPL(__pci_complete_power_transition);
@@ -638,10 +638,6 @@ int pci_set_power_state(struct pci_dev *dev, pci_power_t state)
                 */
                return 0;
 
-       /* Check if we're already there */
-       if (dev->current_state == state)
-               return 0;
-
        __pci_start_power_transition(dev, state);
 
        /* This device is quirked not to be put into D3, so