PCI: add D3 power state avoidance quirk

Libata has some hacks to deal with certain controllers going silly in D3
state. The right way to handle this is to keep a PCI device flag for
such devices. That can then be generalised for no ATA devices with power
problems.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index c95f77d65718..0a3d856833fc 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -572,6 +572,10 @@ int pci_set_power_state(struct pci_dev *dev, pci_power_t state)
                 if (!ret)
                         pci_update_current_state(dev);
         }
+        /* This device is quirked not to be put into D3, so
+           don't put it in D3 */
+        if (state == PCI_D3hot && (dev->dev_flags & PCI_DEV_FLAGS_NO_D3))
+                return 0;
 
         error = pci_raw_set_power_state(dev, state);