diff options
| author | Alex Williamson | 2013-08-08 14:10:02 -0600 |
|---|---|---|
| committer | Bjorn Helgaas | 2013-08-14 15:24:41 -0600 |
| commit | a6cbaadea0af9b4aa6eee2882f2aa761ab91a4f8 (patch) | |
| tree | 15552cbb68ec0824681dfdd6a9bad5865b2e62e9 /drivers/pci/pci.c | |
| parent | 090a3c5322e900f468b3205b76d0837003ad57b2 (diff) | |
PCI: Wake-up devices before saving config space for reset
Devices come out of reset in D0. Restoring a device to a different
post-reset state takes more smarts than our simple config space
restore, which can leave devices in an inconsistent state. For
example, if a device is reset in D3, but the restore doesn't
successfully return the device to D3, then the actual state of the
device and dev->current_state are contradictory. Put everything
in D0 going into the reset, then we don't need to do anything
special on the way out.
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/pci/pci.c')
| -rw-r--r-- | drivers/pci/pci.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 12fccc24925c..deb7fa9cc638 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -3332,6 +3332,13 @@ static void pci_dev_unlock(struct pci_dev *dev) static void pci_dev_save_and_disable(struct pci_dev *dev) { + /* + * Wake-up device prior to save. PM registers default to D0 after + * reset and a simple register restore doesn't reliably return + * to a non-D0 state anyway. + */ + pci_set_power_state(dev, PCI_D0); + pci_save_state(dev); /* * Disable the device by clearing the Command register, except for |