This change is meant to address the fact that ACS state was not being restored as a part of the PCI configuration restoration following a PCIe reset. Without this patch it is not possible to reassign interfaces behind ACS enabled switches following a system suspend as all of the ACS functionality is disabled due to the D0->D3->D0 state transition cycle clearing the configuration state and the fact that the ACS logic was only initialized in probe. Cc: Allen Kay <allen.m.kay@xxxxxxxxx> Cc: Chris Wright <chris@xxxxxxxxxxxx> Cc: Alex Williamson <alex.williamson@xxxxxxxxxx> Signed-off-by: Alexander Duyck <alexander.h.duyck@xxxxxxxxxx> --- drivers/pci/pci.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 0008c950452c..9bd9526f3388 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -1092,6 +1092,9 @@ void pci_restore_state(struct pci_dev *dev) pci_restore_pcix_state(dev); pci_restore_msi_state(dev); + + /* Restore ACS and IOV configuration state */ + pci_enable_acs(dev); pci_restore_iov_state(dev); dev->state_saved = false; -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
