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authorHonghui Zhang <honghui.zhang@mediatek.com>2018-10-16 18:44:43 +0800
committerBjorn Helgaas <bhelgaas@google.com>2019-01-30 10:57:08 -0600
commitb2fb5cc574695a32361a6c1878816b3d6563aa0f (patch)
treeaeda430e417de11a73fa8bdee765253a1a296ff4 /drivers/pci/probe.c
parent01b37f851ca150554496fd6e79c6d9a67992a2c0 (diff)
PCI: Rely on config space header type, not class code
The PCI configuration space header type tells us whether the device is a bridge, a CardBus bridge, or a normal device, and defines the layout of the rest of the header (PCI r3.0 sec 6.1, PCIe r4.0 sec 7.5.1.1.9). When we rely on the header format, e.g., when we're dealing with bridge windows, we should check the header type, not the class code. The class code is loosely related to the header type, but is often incorrect and the spec doesn't actually require it to be related to the header format. Suggested-by: Bjorn Helgaas <bhelgaas@google.com> Signed-off-by: Honghui Zhang <honghui.zhang@mediatek.com> [bhelgaas: changelog, keep the PCI_CLASS_BRIDGE_HOST check] Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/pci/probe.c')
-rw-r--r--drivers/pci/probe.c3
1 files changed, 0 insertions, 3 deletions
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 8e2e4154cdd9..128459a0ffba 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1779,9 +1779,6 @@ int pci_setup_device(struct pci_dev *dev)
break;
case PCI_HEADER_TYPE_BRIDGE: /* bridge header */
- if (class != PCI_CLASS_BRIDGE_PCI)
- goto bad;
-
/*
* The PCI-to-PCI bridge spec requires that subtractive
* decoding (i.e. transparent) bridge must have programming