From: Victor Gu <xigu@xxxxxxxxxxx>
The PCI configuration space read/write functions were special casing
the situation where PCI_SLOT(devfn) != 0, and returned
PCIBIOS_DEVICE_NOT_FOUND in this case.
However, while this is what is intended for the root bus, it is not
intended for the child busses, as it prevents discovering devices with
PCI_SLOT(x) != 0. Therefore, we return PCIBIOS_DEVICE_NOT_FOUND only
if we're on the root bus.
Fixes: 8c39d710363c1 ("PCI: aardvark: Add Aardvark PCI host controller driver")
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Victor Gu <xigu@xxxxxxxxxxx>
Reviewed-by: Wilson Ding <dingwei@xxxxxxxxxxx>
Reviewed-by: Nadav Haklai <nadavh@xxxxxxxxxxx>
[Thomas: tweak commit log.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@xxxxxxxxxxx>
---
Changes since v2:
- The logic has been factorized into a advk_pcie_valid_device()
helper in a previous patch, so this patch was adjusted accordingly.
---
drivers/pci/host/pci-aardvark.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/pci/host/pci-aardvark.c b/drivers/pci/host/pci-aardvark.c
index 82bff709a4b3..9d7f9f1c6837 100644
--- a/drivers/pci/host/pci-aardvark.c
+++ b/drivers/pci/host/pci-aardvark.c
@@ -433,7 +433,7 @@ static int advk_pcie_wait_pio(struct advk_pcie *pcie)
static bool advk_pcie_valid_device(struct advk_pcie *pcie, struct pci_bus *bus,
int devfn)
{
- if (PCI_SLOT(devfn) != 0)
+ if ((bus->number == pcie->root_bus_nr) && PCI_SLOT(devfn) != 0)
return false;
return true;
--
2.14.3