If the pm_cap of the PCI device is unset, do not read the
PCI_PM_CTRL register in pci_set_full_power_state().
Fixes: e200904b275c ("PCI/PM: Split pci_power_up()")
Signed-off-by: Feiyang Chen <chenfeiyang@xxxxxxxxxxx>
---
drivers/pci/pci.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 60230da957e0..d6671cefcfa7 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -1305,8 +1305,10 @@ static int pci_set_full_power_state(struct pci_dev *dev)
if (ret < 0)
return ret;
- pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
- dev->current_state = pmcsr & PCI_PM_CTRL_STATE_MASK;
+ if (dev->pm_cap) {
+ pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
+ dev->current_state = pmcsr & PCI_PM_CTRL_STATE_MASK;
+ }
if (dev->current_state != PCI_D0) {
pci_info_ratelimited(dev, "Refused to change power state from %s to D0\n",
pci_power_name(dev->current_state));
--
2.39.3
