| Message ID | 20130731033212.31931.94340.stgit@bling.home (mailing list archive) |
|---|---|
| State | New, archived |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 91f7bc4..3e71887 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -3393,6 +3393,13 @@ 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); /* * both INTx and MSI are disabled after the Interrupt Disable bit
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> --- drivers/pci/pci.c | 7 +++++++ 1 file changed, 7 insertions(+) -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html