When the current state is already PCI_D0, pci_power_up() will return
0 even though dev->pm_cap is not set. In that case, we should 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 | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 60230da957e0..7e90ab7b47a1 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -1242,9 +1242,6 @@ int pci_power_up(struct pci_dev *dev)
else
dev->current_state = state;
- if (state == PCI_D0)
- return 0;
-
return -EIO;
}
@@ -1302,8 +1299,12 @@ static int pci_set_full_power_state(struct pci_dev *dev)
int ret;
ret = pci_power_up(dev);
- if (ret < 0)
+ if (ret < 0) {
+ if (dev->current_state == PCI_D0)
+ return 0;
+
return ret;
+ }
pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
dev->current_state = pmcsr & PCI_PM_CTRL_STATE_MASK;
--
2.39.3
