[PATCH 1/4] PCI: Don't show errors on inaccessible PCI devices

[Mario Limonciello <superm1@kernel.org>]

From: Mario Limonciello <mario.limonciello@amd.com>

When a USB4 dock is unplugged the PCIe bridge it's connected to will
remove issue a "Link Down" and "Card not detected event". The PCI core
will treat this as a surprise hotplug event and unconfigure all downstream
devices. This involves setting the device error state to
`pci_channel_io_perm_failure`.

As the device is already gone and the PCI core is cleaning up there isn't
really any reason to show error messages to the user about failing to
change power states. Detect the error state and skip the messaging.

Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
---
 drivers/pci/pci.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index e9448d55113bd..7b0b4087da4d3 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -1376,8 +1376,9 @@ int pci_power_up(struct pci_dev *dev)
 
 	pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
 	if (PCI_POSSIBLE_ERROR(pmcsr)) {
-		pci_err(dev, "Unable to change power state from %s to D0, device inaccessible\n",
-			pci_power_name(dev->current_state));
+		if (dev->error_state != pci_channel_io_perm_failure)
+			pci_err(dev, "Unable to change power state from %s to D0, device inaccessible\n",
+				pci_power_name(dev->current_state));
 		dev->current_state = PCI_D3cold;
 		return -EIO;
 	}
-- 
2.43.0