From: Rob Herring <robh@kernel.org>
Date: Fri, 10 Feb 2023 16:43:51 +0000 (-0600)
Subject: PCI: Honor firmware's device disabled status
X-Git-Url: https://repo.jachan.dev/J-linux.git/commitdiff_plain/6fffbc7ae1373e10b989afe23a9eeb9c49fe15c3?hp=-c

PCI: Honor firmware's device disabled status

If a device has a firmware node (DT/ACPI), and the device is marked
disabled, that is currently ignored. Add a check for this condition and
bail out creating the pci_dev.

This assumes the config space for the device can still be accessed because
they already have by this point in order to identify the device.

Link: https://lore.kernel.org/r/20230210164351.2687475-1-robh@kernel.org
Tested-by: Binbin Zhou <zhoubinbin@loongson.cn>
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Liu Peibao <liupeibao@loongson.cn>
Cc: Huacai Chen <chenhuacai@loongson.cn>
---

6fffbc7ae1373e10b989afe23a9eeb9c49fe15c3
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 1779582fb500..b1d80c1d7a69 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1841,6 +1841,8 @@ int pci_setup_device(struct pci_dev *dev)
 
 	pci_set_of_node(dev);
 	pci_set_acpi_fwnode(dev);
+	if (dev->dev.fwnode && !fwnode_device_is_available(dev->dev.fwnode))
+		return -ENODEV;
 
 	pci_dev_assign_slot(dev);