mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 12:43:55 +08:00
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:
parent
090a3c5322
commit
a6cbaadea0
@ -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
|
||||
|
Loading…
Reference in New Issue
Block a user