Commit 975bb8b4dc93 ("PCI/IOV: Use VF0 cached config space size for
other VFs") attempts to cache the config space size of VF0 to re-use
for all other VFs, but the cache is setup before the call to
pci_setup_device(), where we use set_pcie_port_type() to setup the
pcie_cap field on the struct pci_dev. Without pcie_cap configured,
pci_cfg_space_size() returns PCI_CFG_SPACE_SIZE for the size. VF0
has a bypass through pci_cfg_space_size(), so its size is reported
correctly, but all subsequent VFs incorrectly report 256 bytes of
config space.
Resolve by delaying pci_read_vf_config_common() until after
pci_setup_device().
Fixes: 975bb8b4dc93 ("PCI/IOV: Use VF0 cached config space size for other VFs")
Link: https://bugzilla.redhat.com/show_bug.cgi?id=1714978
Cc: KarimAllah Ahmed <karahmed@xxxxxxxxx>
Signed-off-by: Alex Williamson <alex.williamson@xxxxxxxxxx>
---
drivers/pci/iov.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
index 3aa115ed3a65..34b1f78f4d31 100644
--- a/drivers/pci/iov.c
+++ b/drivers/pci/iov.c
@@ -161,13 +161,13 @@ int pci_iov_add_virtfn(struct pci_dev *dev, int id)
virtfn->is_virtfn = 1;
virtfn->physfn = pci_dev_get(dev);
- if (id == 0)
- pci_read_vf_config_common(virtfn);
-
rc = pci_setup_device(virtfn);
if (rc)
goto failed1;
+ if (id == 0)
+ pci_read_vf_config_common(virtfn);
+
virtfn->dev.parent = dev->dev.parent;
virtfn->multifunction = 0;
