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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>
This commit is contained in:
Alex Williamson 2013-08-08 14:10:02 -06:00 committed by Bjorn Helgaas
parent 090a3c5322
commit a6cbaadea0
1 changed files with 7 additions and 0 deletions
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7
drivers/pci/pci.c
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@ -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